What chemical to clean deck for Head install?
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I have never used a sanding disk on any aluminum block as I was always under the impression that they take a little material off with them, which is not what you are trying to do. I always use a gasket scrapper with light pressure and then a product called Pre-Clean which is a chemical that leaves no residue as its real purpose it to make sure metal surfaces are clean before you paint. If there is anything left I will use a flat blade razor with very, very light pressure.