I don't know about the availability over there, but here you can get "gasket remover" made by Permatex. It helps quite a bit (VERY nasty stuff). You may polish the deck surface with some ultra-fine sandpaper to finish the job (1200 grit or higher). Even with a grit that fine you need to make sure not to over work any one area... I recommend wrapping the sandpaper around a piece of plate glass to use as a make shift lapping plate.
Is there any pitting on the deck?
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