Good day detailing community. I am not a detailer, however I am a car flipper. I am looking for advice on two things.

First - I am using a non commercial, BISSELL - SpotClean ProHeat Handheld Deep Cleaner machine to clean cloth interiors and carpets in my cars. My question is, what soap would you recommend for use in this type of machine to help get out basic dirt from car seats

Second question is regarding a recommentation for a moderatly priced orbital buffer to help reduce the work on resorting finishes that have heavy oxidation.

Any advice on either would be helpful.

Thanks