Good evening, I just tried to remove a 3/4 h black chain grease running down my exhaust on both sides (picture below from the harmless side) with WD-40 Specialist Universal Cleaner. It went only in millimetre steps, and the exhaust is still black on the side, one side even large on the side. At this speed I still need hours for it. Do you know an alternative that works better and faster? Thank you very much! Greetings Pistengangster