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Yeah, I'd probably just shake them around in a bucket of water or something.

Normally I'd say give them a soak and a scrubbing, but with lava rock that would pretty much be the definition of a Sisyphean task...

Are you concerned about potential parasites/pathogens, or are the rocks just dirty, or are you just cautious, or something else?

If it's parasites/pathogens/critters you are worried about, simply letting them dry in the sun for a while would probably work. Otherwise, yeah, boiling would work, and so would soaking in a bleach solution.
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