Sorry for the re post just didnt know what category it would go in..

My sons got a 2005 honda rancher and the engine is looking like completly crap, it looks like scum and whole bunch of other build up anything think they have something that can clean this?

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Gunk Engine Brite (Degreaser- they have several varieties) and a mild pressure washing with warm water. You can use Simple Green but be careful cuz it does not like aluminum and can etch.

You still will have discoloration, but at least it would be clean. Then give it a spray with this CD-2 Engine Detailer.