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^^^ I've about broke my back working on cleaning my aluminum heads. I haven't even come close to getting them as clean as yours. I don't have a problem with grease, oil etc. it's the oxidation that I have problems with.
There's still a lot of salt on the roads around here..Yesterday I got behind some idiot who kept drifting off to the side of the road raising up all the salt and now my car has a coating of salt dust all over it.