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Act quickly, but calmly

Most interior stains become permanent problems because of what happens in the first ten minutes, not because of anything exotic in the stain itself. The moment something lands on a seat or carpet, the clock starts. Liquids wick into the foam beneath the fabric, and once they have soaked through, no amount of surface cleaning will shift the mark completely.

Start by lifting off any solids with a plastic scraper or the edge of a credit card. Then blot, never rub. Rubbing drives the stain deeper into the weave and can also fuzz the surface of velour or Alcantara-style fabrics, leaving a permanent bald patch that is far more obvious than the original spill. Press a folded microfibre cloth or a wad of kitchen roll onto the stain and hold it there for ten to fifteen seconds. Repeat with a clean section of cloth until no more colour transfers.

If the spill is liquid, work from the outside of the patch inwards. This stops you spreading the stain into a bigger, paler ring. Cold or lukewarm water is almost always the right first move; hot water can set protein-based stains such as milk or blood, and it can also loosen adhesives under trim.

Fabric seats, carpets and boot linings

Once the bulk of the spill is lifted, a dedicated upholstery cleaner is your best friend. Look for a product designed for automotive fabrics, ideally one that foams rather than soaks. Apply it to a cloth first, not directly to the seat, then work it in gently with a soft brush in small circles.

For everyday marks, a weak solution of washing-up liquid and warm water does a surprisingly good job. A teaspoon in a litre of water is plenty. Anything stronger risks leaving a sticky residue that attracts fresh dirt, which is how seats end up looking grubby again a fortnight later.

• Coffee and tea: blot, then treat with a little cold water and a drop of washing-up liquid. Older marks often respond to a diluted white vinegar solution (one part vinegar to three parts water).
• Fizzy drinks and sweets: these leave sugar behind, which turns sticky and dark. Clean with warm water, then rinse with a clean damp cloth to remove the residue.
• Grease, chips and takeaway drips: sprinkle bicarbonate of soda on the mark, leave it for fifteen minutes to draw out the oil, vacuum, then follow with upholstery cleaner.
• Mud: let it dry completely first, then brush and vacuum. Trying to clean wet mud simply pushes it further into the pile.
• Chewing gum: harden it with an ice cube in a bag, then prise it off. Never pick at warm gum.

Avoid over-wetting. Fabric that stays damp for days can develop a musty smell and, in worse cases, mould in the foam. Leave windows open, run the air conditioning, or place a bowl of bicarbonate of soda in the footwell overnight to absorb moisture and odour.

Leather and faux leather

Leather is more forgiving than most people expect, but it does not like being scrubbed or soaked. Wipe spills with a damp microfibre cloth and a pH-neutral leather cleaner, then dry immediately with a soft towel. For greasy marks, a mild soap solution works well, but rinse it off afterwards so no film is left behind.

Once clean and dry, apply a light coat of leather conditioner. This keeps the surface supple and, usefully, makes the next spill easier to wipe away. Faux leather and vinyl can be treated much the same way, though they tend to be less tolerant of alcohol-based cleaners, which can dull the finish.

Be careful around perforated leather. Liquid pushed through the holes goes straight into the padding, so use a barely damp cloth and patience rather than volume.

Plastic, vinyl and painted trim

Interior plastics are where well-meaning owners do the most damage. Harsh solvents, nail varnish remover, neat bleach and abrasive creams can etch the surface or strip the matte finish, leaving a shiny, discoloured patch that no dressing will hide.

For most marks, warm water with a little washing-up liquid and a soft detailing brush is enough. Stubborn scuffs on door cards often lift with a melamine sponge used very lightly, but go carefully: these are mildly abrasive and will dull textured plastic if overused.

• Ink: try isopropyl alcohol on a cloth, tested first on a hidden area, and wipe away immediately.
• Sunscreen and hand cream: these leave white smears that respond well to warm soapy water.
• Sticky residues from stickers: warm the area with a hairdryer on a low setting, peel slowly, then remove the glue with a little citrus-based cleaner.

Finish with a matte, water-based trim dressing rather than a glossy silicone one. Silicone products attract dust and make dashboards slippery, and they are especially unwelcome on steering wheels and pedals.

Build a small cleaning kit

You do not need a cupboard full of products. A microfibre cloth or two, a soft detailing brush, a small bottle of upholstery cleaner, a pH-neutral leather cleaner, bicarbonate of soda and a pack of kitchen roll will handle the overwhelming majority of interior mishaps.

Keep them in the boot, and deal with spills the same day. A five-minute response now saves an afternoon with a wet vacuum and a lot of regret later. And when you are buying a used car, take a torch and look closely at the seats, carpets and boot floor. Freshly cleaned interiors can hide a great deal, so check for damp patches, lingering perfume smells and overspray on the glass, all of which hint at a hurried tidy-up rather than genuine care.