Steaming oven with lava rocks

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Today for the first time I tried steaming my oven by pouring warm water over hot lava rocks. It works really well but there is a lot of dust from the rocks everywhere. I was wondering I should wash them first? What's your experience with it?

Thanks!

Washing would probably be a good thing. I didn't and by now I've got a lot of dust and probably tiny rock flakes in my steam pan. I expect that's harmless. My rocks aren't lava but the same may happen with lava ones.

BTW, I used to heat my water to boiling in the microwave.  Then I tried using water right out of the faucet and I don't notice any difference in the results.

TomP

No experience with these rocks in a baking environment - but they or any - should be cleaned before usage - and cleaned well. Immerse them in water - agitate - and remove the "floaties". May take a time or 3 - but eventually they'll be clean. Enjoy!