I was thinking of what kind of backer substrate could be used iwth glue to make it easier to peel off, and still allow the glue to dry "quickly." A piece of fiberglass screen would do the job, as would cheesecloth, both are cheap. Paper would slow the drying. I'm gonna try it too. I have a Miles Porgy and Bess LP that got ceiling drywall compound dust on it. One side is dead quiet the other is a nightmare, liquid cleaners have not worked. Granted I never used a machine or hightech liquid.