i get asked all the time about using Seafoam or other products to clean an engine. Granted, those products if used correctly do have their place but with something as simple as a cup of water you can decarbonize your engine. The thing is DON'T USE TOO MUCH! You can actually damage your engine if you put too much in so be careful. That said, on a fully warmed up engine a couple of squirts of water in the engine can break up carbon deposits in your engine. Just before I rebuilt the carburetor on the Ford I decided to perform this procedure and make a video about it. It's a cheap effective way to clean your engine. Like I said though, don't use too much or you'll be putting an engine in