I had a terrible issue where all my records got wet and the covers were fused together by mold. After lots of trial an error the thing that worked for me and worked perfectly was glass cleaner (non amonia as noted above). Glass Plus or something similar I believe. It took everything off including the fingerprints and left the albums spotless as they have never been before. Absolutly worked like a charm. Note; All my albums are from late 60's on up which seem to have a softer vinyl than the old albums from eons ago. So I can't vouch for records from the 20's, 30's etc.
Good luck, John
Good luck, John