04-03-2012, 04:17 PM
The best thing I've found to get rid of carbon is General Motors Top End Cleaner. I apply a generous amount with a 45cal Mop and let it work for a while and reapply as needed. The stuff is REALLY NASTY Smelling and for safety sake work in a ventilted area. I have friends that use Mercury Outboard Carb Cleaner and seem to like it. Works well on bolts and carriers also.