I got interested about cleaning vinyl and what the grooves look like. I took the most beat up lp I had - Cream's Wheels of Fire - and took pics before and after cleaning. The lp was already junk. 1) Air blast with canned air 2) Dawn dish detergent with a new cellulose sponge. Gently wipe and rinse. 3) Rinse with DI water. The vinyl dewets nicely. Before cleaning....look how thin that groove wall is. I wonder what the spec is?