Yes by all means try the water first. I had some coins that had been glued to cardboard and the cardboard was still stuck to them. Soaked them in acetone for a day or so and no luck so I let them sit for 2 more weeks. Nothing, nada, zilch, the cardboard and glue was still there. So I was pouring a glass of water from my Britta and said to myself why not. well about 15 minutes later I pulled one out of the water and rubbed it with my finger and the crud started coming right off
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