Car Carpet & Upholstery Cleaners

Water, mostly. A household carpet cleaner is built for carpet laid over underlay in a room that can air out for a day. Car carpet is bonded to a metal floor with foam underneath it, so anything that soaks through has nowhere to go, and a soaked floor in a sealed cabin turns into a damp smell within a few days.

That's why a car carpet cleaner works differently. Low moisture, low foam, and formulated to release dirt so it can be lifted straight back out rather than driven deeper into the pile. Foam matters more than people think, a household product foams up beautifully and then leaves residue behind that attracts dirt faster than before you started.

The products here fall into three groups. Spot cleaners for a single stain, sprayed and agitated on the spot. General carpet and upholstery cleaners for a full interior by hand. And extraction solutions like MIRCH Erebus Blast, which are made to go through a carpet extractor rather than a spray bottle.

They're also pH matched to automotive fabric, which is the other reason not to reach for what's under the kitchen sink.

Less water than you think, and more agitation.

Seats are harder than carpet because of what's underneath them. The foam in a seat base soaks up whatever you put on it and holds onto it, so a heavy-handed car seat cleaner leaves you with a wet seat that takes two days to dry and smells for a week. The trick is to work the cleaner into the fabric rather than into the foam.

Vacuum first, properly, including down the sides and into the seams where the worst of it collects.

Spray the cleaner onto a brush or a cloth rather than straight onto the seat, unless you're treating a specific stain. A fabric car seat cleaner like CARPRO Inside or Koch Chemie Pol Star is designed for exactly this, and Pol Star handles alcantara as well, which most cloth seat cleaners don't.

Agitate with a soft interior brush in short strokes, then wipe away with a clean microfibre cloth before it dries. Keep turning the cloth, a loaded one just moves the dirt around.

Repeat rather than soak. Two light passes beat one heavy one every time, and you'll get a seat that's dry in an hour instead of overnight.

For a stain that won't shift, a dedicated spot cleaner or an extractor is the next step up. On leather or vinyl seats, use a leather cleaner instead, cloth seat products are too aggressive for a coated leather finish.

It depends what you're facing, but broadly:

For a single stain, a spot cleaner. Spray, agitate, blot, done. Something like Shine Supply Super Spot is made for exactly this, and it's the sort of thing worth keeping in the boot.

For a general interior clean, a carpet and upholstery cleaner you can dilute and use across carpet, mats and seats. A general purpose cleaner like Shine Supply Carpet & Upholstery Cleaner covers the everyday work, and a more versatile cleaner such as Koch Chemie Pol Star handles cloth, alcantara and leather from one bottle if your interior is a mix.

For a car that's had a hard life, an extraction solution like MIRCH Erebus Blast run through an extractor, which pulls the dirt and the water back out rather than leaving it sitting in the foam.

Whatever you use, you'll want something to agitate with. A soft interior brush for seats and a stiffer one for carpet does most of it, and a Tornador Basic is the step up if you've got a compressor.

If you're not sure, tell us what you're dealing with and we'll point you at the right one.

The cleaner does the chemistry, the tool does the work. How far you go depends on how bad the car is.

• Vacuum. Always first, and the step people rush. Loose grit left in the pile turns into mud the moment you add cleaner, and a wet and dry vacuum means you can pull moisture back out afterwards too.
• Brushes. The cheapest and most effective way to agitate. Stiffer bristles for carpet and mats, softer ones for seats and delicate fabrics, and a smaller brush for seams and around seat rails where the worst of it collects.
• Tornador cleaning guns. If you've got an air compressor, a Tornador combines air and cleaning solution to blast dirt out of fibres and vents at the same time. It's the fastest way through a full interior and it reaches places a brush can't.
• Microfibre cloths. For wiping residue away before it dries and lifting what the brush has loosened. Keep turning to a clean side, a loaded cloth just moves dirt around.
• Steamers. Heat breaks down grease and sanitises without soaking anything, which makes a steamer useful on headliners, seams and anywhere you can't afford to get wet.
• Extractors. The serious option. They spray solution into the carpet under pressure and pull it straight back out with the dirt, so the interior comes up cleaner and far drier than anything you can do by hand. Worth it if you're doing interiors regularly.

Test any new product on a hidden section first, under a seat or in the boot, before you take it across a whole interior.