Caring for upholstered furniture
Upholstery care consists of cleaning the fabric coverings with a vacuum cleaner or a fairly stiff brush. In case of heavy soiling, clean the fabric with dry foam. Remove grease or oil stains with gasoline or clean with a stain remover. Do not pour the cleaning solution on the stain to avoid streaks. Rub stains in a circular motion. Most stains can be removed with a warm soapy solution.
(Information taken from this resource BMWMAN)