How to clean dirty oil / grease stain on acrylic

Gently remove grease residues with a rounded knife blade.

Then put a small amount of butter or margarine on the stain, and leave for 5 minutes. Remove excess with the back of a knife. Place the garment on a clean white cloth and dab the stain with another white cloth soaked in pure white spirit.

Proceed with a normal wash, according to care instructions.