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Clean on these types of things to me means that acetone or lacquer thinner on a clean paper towel rubbed on the surface in question produces NOTHING... any color showing means more cleaning is needed....
If one has seen micrographs of 'very smooth metal surfaces'... you can see that they are not very smooth.. so to fill those voids I use gasket cement to keep from having to do it over... about the worst punishment I can think of....
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