The tire shouldn't touch the table because of the wheels flanges. The only physical contact would be with the wheel itself. So we may be able to rule out the furniture polish. Since the engine was bought used, the seller may have cleaned the wheels with a solvent that got between the tires and wheels and never evaporated eating the tire over time. It also could have been run immediately after the seller cleaned his tracks. D500, do you have any contact info from the seller so that you can ask him what he uses? This makes me want to experiment with solvent liquids that we all normally use, then take some used replaced tires and let the soak in a jar of each, to see what will dissolve them.
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