Well today I went to walmart, just looking for stuff that icould use to clean my engine. Well I bought a bottle of CLR, went home and used it in a small spot with a tooth brush and was amazed it actually brings back the old engine color. My engine look like crap from mud and stuff and figured i would give it a try, and it worked. The bottle is only $4.75, and it makes your engine look good. I will post before and after pics after im done.