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Acetone is the strongest Ive seen, but ya it will clear take off your stamp so unless your gonna use surgical persision, Hot soapy water works best with a sponge, One Thing I have recently discovered for cleaning your wall pieces that should already be clean, is "GOO GONE" this works like a charm , its like waxing your car the way it makes them shine, Ive gone ahead and tested it on the all my foil stamps and white stamps ( on the 11x KC Tee Bird) and they all are just fine. spray the disc w/ a mist of it, using a soft smoothe towel and then over again with a dry one.
I had a friend that ran his through the dishwasher and the soap had some kind of dual cleaner in it. His discs ended up with a coat on them almost like wax. He couldn't throw them because he couldn't hold on to them. He replaced most of them after that. We laughed at him forever.
Never put your discs in the dishwasher.