i was just on my way home when a customer at a comercial job rang me and said a van had leaked oil all over so i went down and after soaking the worst up with grit i scrubbed in some drive cleaner/degreaser just a basic off the shelf one ive got rid of the oil stains as far as i can tell ( on concrete and tarmac) but theres still a greasy film coming threw/ on the water will this dry ok or is there a stronger chem i can use to break this down?