Before you start its best to vacuum and big bits up first.
You can clean fabric and carpets with a hand brush, a drill brush a wet vac / extractor or a combination of these.
We have two main fabric cleaners, Chemical Guys Lightning fast which is for use with a hand or drill brush, and can also be used as a pre soap before using a wet vac / extractor.
And Chemical Guys foaming Fabric Cleaner which is designed to be used in an extractor machine, wet vac, or diluted into a spray bottle with water to be used as a normal carpet cleaner like Lightning fast.
When in doubt get our Stain Remover & Cleaner Kit with the hand brush option. This is very effective and is the best all round solution for cleaning Car interior fabrics and carpets, from a full clean to spot cleaning and removing stains.