Diesel is a type of fuel that is most often used to run large trucks and tractor trailers. Diesel stains are a bit tough to remove, but it is more than worth it to save that fabric or hard surface from looking stained, dingy and dull. The method for removing diesel stains is the same for both hard and porous surfaces, from carpet to hardwood flooring.
Apply heavy duty detergent onto the diesel stain.
Allow the detergent to soak in for 10 minutes.
Scrub the stain with an old cloth.
Spray water over the stain using a spray bottle.
Blot up the liquid with paper towels until they come up dry.