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Cleaning slabs

MasonGMasonG Posts: 6,268 ✭✭✭✭✭

I have a group of coins in slabs with something on them, but I don't know what- kind of splotchy patches. It's hard to tell if it's on the slab surface or eaten into it. Windex and a rag doesn't really help much. Has anybody had experience cleaning off something like this?


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