I think that those are shellac discs? If so, I do not think that the concoction is appropriate for shellac discs because shellac was an alcohol based material and the concotion includes some agents (anti-freeze glycols and isopropyl alcohol) that are also alcohol based. So, (although I never tested it on shellac discs) I would be concerned that it could attack the record chemically. But, I really do not know. Perhaps take one record that is in bad shape and was cheap and very dirty and give it a try and see what happens.
Craig
Craig
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