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catloaf ,

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.

tpihkal ,

That’s the answer. Figure out what you need and wear PPE as necessary.

Tar_alcaran ,

Aqua regia and safety squint!

Mo5560 ,

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.

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