Removing a stain from your car upholstery should be handled carefully. You never want to spread the stain across your car seat. The first step is to spray Foamy upholstery on your car upholstery and wait a few minutes. Scrub the stain with a microfiber towel or brush. Then dry the stained upholstery with a clean cloth. Repeat until the stain goes away and you no longer see discoloration on the cloth you are using.