Three companies can quote you for an "interior clean" and mean three completely different jobs. One means a vacuum and a wipe of the dashboard. One means steam, brushes and an hour on the vents and seat rails. One means wet extraction that pulls dissolved dirt out of the fabric. The prices differ, the results differ enormously, and the words don't tell you which you're getting. Here's how to decode it.
The three tiers, explained properly
Tier 1 — Standard interior valet
Vacuum of carpets, seats and boot, a wipe-down of hard surfaces, glass cleaned inside, mats shaken out or washed. It's maintenance. On a reasonably tidy car it's exactly right and there's no reason to pay for more.
Good for: a car that's cleaned regularly and just needs a refresh.
Won't fix: stains, smells, ground-in dirt, anything below the surface.
Tier 2 — Interior deep clean
This is where the work gets detailed. Steam and detail brushes into the places a vacuum can't reach: seat rails, seatbelt housings, air vents, switchgear, door shuts, the gap between seat and console. Hard surfaces are cleaned rather than wiped. Fabric is treated and agitated. Steam sanitises as it goes, which is what deals with bacteria and the sources of smell rather than covering them.
Good for: family cars, pets, anyone who eats in the car, cars that have never had more than a vacuum.
Won't fix: deep liquid spills that have soaked into the foam.
Tier 3 — Upholstery shampoo / wet extraction
A cleaning solution is worked into the fabric, then a machine injects and immediately extracts the moisture, pulling the dissolved dirt out with it. This is the only method that genuinely removes contamination from inside the material rather than off the top of it.
Good for: spilled drinks, sickness, pet accidents, smoke, second-hand cars with unknown history, pre-sale preparation.
The catch: drying time. More on that below.
So which do you actually need?
- "It just looks a bit tired" — Tier 1, maybe Tier 2 once a year
- "There's a smell I can't place" — Tier 2 with steam. Smell is usually bacteria in fabric or a damp footwell, and masking it never works
- "The dog travels in the back" — Tier 2, and ask specifically about pet hair, which needs its own technique and takes real time
- "Someone spilled a milkshake three weeks ago" — Tier 3, no question. It's in the foam
- "I'm selling it" — Tier 2 minimum. A clean interior does more for a viewing than almost anything else you can spend the money on
- "It's damp and the windows fog up" — that's a different problem. See our guide to mould and odour removal
Leather is a separate conversation
Leather shouldn't be shampooed like fabric. It needs a pH-balanced cleaner, gentle agitation with a soft brush to lift dirt out of the grain, and then — the step most people skip — a conditioner to put moisture back. Skip conditioning and leather dries, hardens and eventually cracks along the seat bolsters, which is expensive to put right.
If your car has leather or part-leather seats, check the quote covers leather cleaning and conditioning as a distinct step rather than lumping it in with the fabric work.
The bit nobody mentions: drying time
Wet extraction puts moisture into your seats. A good operator extracts most of it back out and uses air movers, but the car still needs to dry properly — and in a British November, a damp interior with the doors shut is precisely how you create a mould problem while trying to solve a stain one.
Ask how long it needs, whether they'll be drying it actively, and plan to leave the windows cracked in a garage or ventilate it for a few hours. This is a big reason we lean on steam: it sanitises deeply with far less residual moisture. Wet extraction still has its place, but it should be a deliberate choice for a specific problem, not the default.
Four questions that get you a straight answer
- "Does that include steam, or is it vacuum and wipe?"
- "Is upholstery extraction included, or extra?"
- "How is leather handled — is conditioning included?"
- "How long will the interior need to dry?"
Any company that does this properly will answer all four immediately.
Getting it right first time
Our interior deep clean and steam service covers West London, and the honest approach is to tell us the actual problem when you enquire — the smell, the spill, the pet hair, the tired seats. Send a photo and we'll tell you which level the car genuinely needs. Sometimes that's less than you expected. Ask for a free quote.
