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What is the best way to clean chemical bottles?

I was recently given a bunch of darkroom equipment including chemical bottles like this and this. The bottles are 25 years old, and I'm sure they weren't cleaned after they were emptied. I would like to use the bottles for new chemicals, but don't want to contaminate them with whatever chemical residue remains in the bottles. Is there a good way to clean them, or should I just buy new ones?

Thanks,

Noah

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