One removes what is loose. The other removes what is soaked in.
Verdict
Shop vac first, extractor second, and the extractor is what you charge extra for. A wet dry vacuum removes crumbs, sand, pet hair and spilled liquid, which is most of an interior clean. An extractor sprays solution into the fabric and pulls it back out with the dirt, which is the only way to deal with set-in stains, smells and upholstery. The extractor is what turns a fifty dollar clean into a premium job.
Under $100
Check Stanley 6 Gallon Wet/Dry Vacuum PriceUnder $100
Check BISSELL Little Green Mini Extractor Price| Stanley 6 Gallon Wet/Dry Vacuum | BISSELL Little Green Mini Extractor | |
|---|---|---|
| Removes loose dirt and debris | Yes | No |
| Removes set-in stains | No | Yes |
| Handles liquid spills | Yes | Yes |
| Deals with odour in fabric | No | Partly |
| Drying time after use | None | Hours |
| Job price it supports | Standard clean | Premium interior |
You are starting and you want to be able to do a full interior today. A wet dry vac with a crevice tool and a brush attachment handles the overwhelming majority of what is in a car, and it doubles as your general workshop vacuum. Buy one with a blower function, which is genuinely useful for clearing vents and seat rails.
Check Stanley 6 Gallon Wet/Dry Vacuum on Amazon
You are ready to charge more for interiors. Extraction is what removes coffee, pet accidents and years of ground-in grime from fabric, and customers see the before and after immediately, which is what justifies the price. Warn the customer about drying time, and never soak a seat you cannot dry, because damp upholstery grows mould and that is a complaint you cannot fix.
Check BISSELL Little Green Mini Extractor on Amazon
Brushes in a few stiffnesses, microfibre towels in quantity, an all purpose cleaner diluted appropriately, glass cleaner and a fabric or leather product depending on the interior. That is a modest list and it is where most of the visible result comes from.
Steam is excellent for sanitising and lifting grime from hard surfaces and vents, and it does not extract, so you still need something to remove the loosened dirt. It is a third tool rather than a replacement for either of these.
If you are working on customers' vehicles, check your local licensing requirements and get liability cover. Damaging an interior, or a customer alleging you did, is the risk that ends a side hustle, and cover is inexpensive relative to a single claim.
Comparison based on published manufacturer specifications and the general consensus of owner reports. We have not tested these units side by side. Confirm current prices and specifications before buying. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.