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You use a solvent that is stronger than what you want to remove, but not so strong that it also removes the thing you're trying to clean.
That's the answer. Figure out what you need and wear PPE as necessary.
Aqua regia and safety squint!
Ngl I have mixed aqua regia to clean out my pestle and mortar in a lab course once. Shit went from uncleanable to clean really quick. H_2O_2 + conc. HCl is sufficient for most extreme cleaning needs tho.