This is if you have a shop vac which can take water.
1. Knock the dirt with a brush, to break it up and let it get hoovered up in step 2.
2. Hoover the seats
3. Carry out a test spot in a hidden area with your chosen cleaner, I use Koch Chemie Polstar (or greenstar if it requires more punch) prior to use to ensure colour fastness.
4. Spray the cleaner on the seats and lightly agitate with a soft - medium brush or a scrub pad eg (
https://www.in2detailing.co.uk/products/in2detailing-multi-purpose-scrub-pad )
5. Extract the sprayed areas
6. Spray the seats with fresh clean water
7. Extract the sprayed areas
8. Spray the seats with fresh clean water evenly and spread by hand to ensure it gets into tight areas
9. Extract the sprayed seats
10. Park car in sunlight if possible with a window slightly ajar or pop the sunroof if you have one, until dry.
Done.
Before anyone asks why to spray with water twice, the first time is to remove any residual cleaner and the second time is to stop staining coming back up when it dries.