How to Clean Carpet: Methods, Stain Removal & Drying

The friends have gone, the lights are on, and there it is: a dark ring on the living room carpet where a glass of red wine went over, a muddy half-moon by the door, and a general greyness along the path from the sofa to the kitchen that you only notice in daylight. You could hire a machine, buy a spray, or ring someone. Or you could do nothing and hope the vacuum copes.

Most carpets can be brought back with a sensible order of work: vacuum properly, treat the marks, clean the whole carpet using a method that suits the fibre, and above all dry it quickly. The right method matters less than avoiding the two classic mistakes, using too much water and giving up on drying. This guide walks through that order, then what to do if the carpet still looks wrong.

Prefer to mix your own? See our guide to a homemade carpet cleaner solution with low-foam recipes for machines and hand cleaning.

Disclosure: Cleaners Guide is a participant in the Amazon Associates programme, so if you buy through links on this page we may earn a small commission at no extra cost to you. It never changes our recommendations, we suggest products because they work and we point out cheaper options where they do the same job. Prices and availability change, so always check the current price before buying.

Before you start: know your carpet, then get the room ready

Check what you have before you reach for a cleaner, because the fibre decides what it can take. The label on the back of a spare off-cut, the receipt or the retailer’s page may say. If not, a wool carpet usually feels softer and springier, smells faintly like a jumper when damp, and costs more, while the rest are most commonly synthetic.

Read any care label or instructions from the retailer, as some carpet warranties specify cleaning methods or products. Then spot test every product in a hidden place, such as inside a wardrobe or under a sofa. Apply a little, blot, wait until the spot is fully dry, and check for colour on the cloth, colour change, or a change in texture.

A few words on wool

Wool is a natural protein fibre, which is why it behaves differently. It is damaged by strong alkalis such as ammonia and some laundry-type detergents, and it can shrink, felt or lose colour with heat and rough handling. It also holds water for longer than synthetic fibres, so a wool carpet cleaned too wet can take a long time to dry and may develop a musty smell. Choose a cleaner that says it is suitable for wool, use cool or warm water, use less of it, and dry quickly. If it is a good quality wool carpet, a professional with experience of wool is often the most cautious option.

Get the room ready

• Clear the floor. Move furniture out, or at least lift the legs onto foil or plastic tabs so that wood or metal feet do not stain damp carpet. Pick up toys, cables and loose items.
• Vacuum slowly, in two directions. Dry grit is the main thing that makes a carpet look dull, and it turns to mud when wet. Empty the bin or bag first, and if suction is poor, check the filter. Our guide to cleaning a Henry Hoover filter shows how.
• Mark the stains. A strip of masking tape beside each one helps you find them again once the carpet is damp.
• Pre-treat stains. Use the stain guide below, and test first.
• Open windows and set up fans before you begin, not after, so airflow is ready when the carpet is wet.

The method: a whole-room clean, step by step

This works whether you use a hired machine or do it by hand. The machine saves effort, but the logic is the same: loosen the dirt, flush it out with as little water as possible, and dry fast.

1. Pick your method. Hot-water extraction (often called steam cleaning) uses a machine that sprays a cleaning solution and sucks it back up. Shampooing machines or hand scrubbing work the foam into the pile. Dry powders and encapsulation products use very little water. The options are compared further down.
2. Mix the solution as the label says. More concentrated is not better. Too much detergent leaves a sticky residue that attracts dirt and makes the carpet re-soil quickly.
3. Work in sections of about a square metre or two. Start at the far corner from the door and work backwards, so you never stand on carpet you have just cleaned.
4. Apply and agitate lightly. With a machine, make slow, overlapping passes. By hand, apply the solution sparingly with a spray or damp sponge and work it in with a soft brush. Scrubbing hard can fuzz the pile and push dirt deeper, especially on loop pile.
5. Leave it for the dwell time on the label, usually a few minutes, but do not let it dry on the carpet.
6. Extract or blot. With a machine, go over the area again with the suction only, until the tank water looks clearer. By hand, blot with thick clean towels and replace them as they get wet.
7. Rinse if the product calls for it. Many hired machines have a rinse pass with clean water, which removes the detergent that otherwise attracts dirt.
8. Dry it, as covered below, then vacuum when it is fully dry to lift the pile.

It is worth wearing rubber gloves, and ventilating the room, especially with solvent-based stain removers. Keep children and pets out of the room until the carpet is dry and any smell has cleared. Take care when moving furniture back, and put plastic or foil under the feet until the carpet has fully dried. Check the product label for safety advice, never mix products, and store solutions out of reach.

Keep clean and dirty water separate if your machine has two tanks, empty the dirty tank when it is about half full, and refill the clean tank with fresh water. Check the manual about water temperature, because very hot water is not good for every carpet, particularly wool. Cables and wet floors are a poor combination, so keep the mains lead behind you and out of the wet area.

Cleaning by hand

Hand cleaning suits a single stain, a stair carpet or a small room. Mix carpet shampoo or a drop of washing-up liquid with water as the label says, and put it in a spray bottle so you can control the amount. Spray lightly, working an area of about half a metre square at a time, and work it into the pile with a soft brush, using small circles and little pressure. Blot with a clean, dry towel pressed firmly with your foot, and swap towels as they pick up dirt. Finish with a spray of clean water, blotted dry in the same way, to remove detergent. Keep the carpet damp, not wet: if the underlay can be felt squelching, you have used too much.

Using a machine well

• Vacuum first, then fill the clean tank with the solution at the strength on the label.
• Move at a steady, slow pace, pulling the machine towards you while you spray, and pushing it forward without spraying to extract. Overlap each stripe a little to avoid lines.
• Make a second suction-only pass on heavily soiled areas, and keep going until you see little water coming up.
• Empty the dirty tank when it is about half full, because a full tank loses suction and leaves the carpet wetter.
• Rinse out the tanks, hoses and tools after use, and let them dry. Return hired kit clean, and check the nozzle for hair and fluff.

Dry powders and encapsulation

Dry cleaning compounds are absorbent granules or powders with a small amount of cleaning agent. You sprinkle or spray the product, work it into the pile with a brush or a machine, leave it for the time on the pack, and vacuum it up with the soil it has absorbed. Encapsulation products work similarly: a polymer coats the dirt as the product dries into a crystal that the vacuum removes. Both are useful where you cannot afford a long drying time, or on delicate carpets that dislike water. The caution is that they clean the upper part of the pile, so they will not shift deep, wet or old stains, and any powder left in the pile is itself a source of dirt, so vacuum thoroughly and repeatedly.

Which method is right?

Hire machines are available at many supermarkets and DIY stores. Prices vary, so check the cost of hire and cleaning solution against a professional quote, particularly if you have only one or two rooms. A professional with stronger equipment may dry the carpet faster, and for wool and delicate carpets their experience is worth paying for. If you choose one, a member of a recognised trade body such as the National Carpet Cleaners Association is a sensible starting point. Check your carpet warranty before hiring anyone.

Stains, one at a time

Always blot, never rub. Work from the outside edge of the stain towards the middle to stop it spreading, and use a clean part of the cloth each time. For most unknown stains, cold water and a clean cloth are the safe start.

Some points worth knowing. Baking soda sprinkled dry on the carpet, left for a few hours and vacuumed up, absorbs odours, but it is not a stain remover and should always be vacuumed up completely. Mixing vinegar and baking soda on the carpet gives a fizz but little extra cleaning, and leaves residue, as explained in our piece on whether baking soda and vinegar really clean. Do not use ammonia or bleach on carpet. Both can strip dye and damage fibres, and ammonia can harm wool. Hydrogen peroxide can lighten dyes, so only use it on pale carpets after a test, if at all. For machine-friendly recipes and what each ingredient does, see our homemade carpet cleaner solution guide.

Speed is the biggest factor in whether a stain comes out. A fresh spill sits on top of the fibres and mostly needs absorbing, while an old one has bonded with the dye sites and needs a chemical or an enzyme to loosen it. Keep a small kit where you can reach it: a roll of white kitchen paper, a clean white towel, a spray bottle of water, washing-up liquid and a bottle of enzyme cleaner. Use white cloths, not coloured ones, so you can see what you are lifting and avoid transferring dye. Once a stain has been treated, go over the area with plain water, blot, and let it dry before you decide whether it needs another round, because stains look darker when wet.

Urine, pets and the smell that will not go

Urine soaks through the pile to the underlay, which is why a surface clean seems to work and then the smell comes back in humid weather. Blot as much as you can, then use an enzyme cleaner generously enough to reach the same depth, leave it for the time on the label, and blot again. Avoid steam cleaning a urine stain before you have treated it with an enzyme product, because heat can fix the proteins and the smell. If an old stain is still smelly after two or three treatments, it may have reached the underlay, and cutting out and replacing that piece may be the only answer.

Set-in stains

An old stain will not shift in one go. Re-wet it with a little water, apply the right treatment for its type, leave it for the full contact time, blot, and repeat. Patience works better than heavy scrubbing. Accept that some dyes and old tannins leave a ghost, and that a clean patch can look brighter than its surroundings, in which case clean the whole area to the nearest natural boundary, such as a doorway or furniture line, so it blends in.

Loop pile, high pile and low pile

Loop pile (Berber-style) carpets have uncut loops that catch on stiff brushes and rotating beaters, so use suction-only vacuuming, a soft brush, and a low-moisture method. Deep or shag pile traps more soil and dries slowly, so it needs more careful extraction and more time. Low, dense pile cleans more easily and dries faster, though it also shows traffic wear sooner. Whatever the type, tufts that stick up after cleaning can be snipped level with scissors, but never pulled, because pulling a loop or tuft can unravel a line of the pile.

Drying, and what comes after

Drying is the part most people underestimate. A damp carpet and underlay can start to smell musty within a day or two, and mould can begin to grow in warm, damp conditions, so the aim is to be dry as soon as possible. How long it takes depends on how much water you used, the pile, the fibre, and the airflow. Wool and thick, dense pile take longest. Plan on many hours and sometimes overnight, and be prepared for more if the weather is damp.

• Open windows on opposite sides of the room for a through-draught, if the weather is dry.
• Point a fan across the carpet, not into it, and use more than one if the room is large.
• Run a dehumidifier with the windows closed in damp or cold weather. Which type works best varies with the temperature, so follow its manual.
• Keep the heating on a gentle setting rather than blasting it, since steady warmth and airflow work better than extreme heat.
• Lift furniture legs onto foil or plastic and keep bedding, curtains and rugs off the damp area.
• Press a dry white cloth against the carpet. If it picks up moisture, or the carpet feels cool to the hand, it is not ready.

Equipment can help. Ordinary oscillating or pedestal fans are fine for a domestic room, and a hired air mover moves a lot more air for a big job. A compressor dehumidifier works well in a warm room, and a desiccant model copes better in a cold one, so match it to the room and check what its manual recommends. A cheap hygrometer will tell you how humid the room is. Ideally the humidity falls steadily as the carpet dries, and if it stays high the room needs more ventilation or more drying capacity.

Try to keep off the carpet until it is dry. Walking on damp carpet flattens the pile, transfers dirt and sock dye, and pushes moisture into the backing. If you have to cross it, lay clean towels or walk in clean, dry socks. Once it is dry, vacuum to lift the pile. If a musty smell develops, open the windows and run a dehumidifier. Lingering damp can lead to mould, and our guide on what kills mould covers the next steps. If a leak or flood has soaked the carpet, the rules change: clean water needs drying within a day or two, and floodwater or sewage is contaminated and calls for a professional and probably replacement.

Carpet protector sprays can slow staining on a clean, dry carpet. Read the label, test first, ventilate during application, keep pets and children away until it has dried, and note that protection wears off with traffic. Deodorisers are fine as a finishing touch, but an odour that returns means something is still in the carpet or underlay.

When to bring in a professional

• Wool, silk or antique carpets, and anything valuable or hard to replace.
• A large area of heavy soiling, or a smell that has come back after you have treated it.
• Water damage from a leak or flood, particularly if it has been wet for more than a day or two.
• Dye stains, bleach damage, and stains that have spread despite treatment.
• Allergies or asthma that seem to get worse, where a thorough extraction clean might help.
• A warranty that requires professional cleaning.

If it did not work: what to try next

If you have been through two sensible attempts and a stain or smell remains, a professional with a hot-water extraction setup, or a specialist stain treatment, will usually do better than a third round at home. Mention the products you have already used, because some combinations leave residues. Other signs that cleaning is not the answer are carpet backing coming away, matted traffic lanes, mould on the underside, or smells that return after professional treatment.

What to buy, and what you can skip

A vacuum, clean cloths and some washing-up liquid will see you through light cleaning. For a full clean, three things are worth considering. A carpet cleaner solution is the detergent for a hired or owned machine, or for dilution by hand. Choose a low-foam formula meant for your type of machine, check that it is suitable for your fibre (wool-safe if you have wool), and use the amount on the label, no more. For spills and marks, a carpet stain remover or stain remover spray gives you something to treat a fresh mark with before it sets. Look for an enzyme formula if pets are involved, and a general stain remover for food and drink, and test before using on any visible patch. If you do your own whole-room cleans more than a couple of times a year, or have pets and children, a carpet cleaning machine may pay for itself compared with repeated hire. Check the tank sizes, how much suction it has, whether it has a hot-water heater and a rinse mode, the weight, and how easy it is to empty and clean. Buying makes less sense for a single annual clean, where hire or a professional is simpler and needs no storage space.

Skip heavily scented sprays that mask smells, strongly alkaline cleaners, and any product that does not say it is for carpets. The links above are Amazon UK searches, so you can compare current prices and reviews yourself.

Keeping carpets clean, and knowing when to replace them

Regular care does more than any single deep clean. Vacuum high-traffic areas several times a week and the rest weekly, using suction-only on loop pile. Take shoes off at the door and use a good entrance mat, because most of the grit on a carpet is carried in on shoes. Deal with spills straight away, move furniture slightly from time to time so that the pile is not permanently crushed, and clean the hallway and stairs, which wear fastest. Plan a deep clean once or twice a year, more often with pets, young children or allergies. Many manufacturers suggest professional cleaning roughly every 12 to 18 months, but follow your carpet’s own guidance.

Protect the areas that wear fastest. A good entrance mat captures much of the grit that comes in on shoes, and a runner on the hallway or stairs protects the most trodden strip. Change the position of rugs and furniture occasionally so that the wear is spread out. If you have pets, trim their claws and wipe paws after wet walks. These small habits do more for appearance than a deeper clean every year.

Know when to stop. Carpet is due for replacement when the backing is failing, seams are coming apart, traffic lanes are bald, a smell persists after professional treatment, or there is mould in the underlay. The same cleaning principles, blotting, minimal water and fast drying, apply to car upholstery in our car seats guide, to rugs and to mattresses. Moving and cleaning furniture is easier with a plan, and our furniture guides and cleaning products section cover the rest. Grout is another surface that holds grime and rewards a methodical approach, as covered in our grout cleaning guide. More ideas are on the Cleaners Guide homepage.

Ten quick answers about carpet cleaning

• How often should I deep clean carpets? Once or twice a year suits most homes. Clean more often if you have pets, young children, allergies or very heavy traffic, and vacuum regularly in between.
• Can I use washing-up liquid on carpet? Yes, sparingly. A small amount in a cup of warm water works for spot cleaning, but too much leaves suds and residue that attract dirt, so always rinse with clean water and blot.
• How long does carpet take to dry? It varies from several hours to more than a day, depending on how much water was used, the pile, the fibre and the airflow. Use fans and a dehumidifier, and do not walk on it until it is fully dry.
• What is the difference between steam cleaning and dry cleaning? Steam cleaning usually means hot-water extraction, which flushes dirt out with water and suction and dries slowly. Dry cleaning uses powders or very little moisture, so it dries fast but is better for light soiling.
• Should I hire a professional or do it myself? DIY suits routine cleaning, spot treatment and hardwearing synthetic carpets. Choose a professional for wool, delicate or expensive carpets, severe stains and smells, or if your warranty requires it.
• Can I walk on the carpet straight after cleaning? It is best not to. Damp pile flattens, picks up dirt and moisture gets pushed into the backing. If you must cross it, use clean towels or clean dry socks.
• What household items can I use for emergency stains? Cold water, a clean cloth and a little washing-up liquid cover most spills. Club soda helps with fresh drink spills, baking soda absorbs odours when vacuumed up, and ice hardens gum for removal.
• Why does my carpet smell after cleaning? Usually slow drying or damp underlay, leftover detergent, or a deep stain wicking back up. Dry it faster, rinse out residue, and if a smell persists, ask a professional to check the underlay.
• Is baking soda and vinegar good for carpets? Not really. The fizz is brief and the mixture leaves residue. Use baking soda dry to absorb odours and a proper carpet cleaner or an enzyme product for stains.
• Are steam cleaners safe on wool carpets? Check the care label and the machine manual first. Wool is damaged by heat and strong alkalis, so use a wool-safe product, keep the water cool or warm, use as little as possible and dry it quickly. A professional is often the safest choice for wool.