What is the best way to clean aquarium decorations?

Question by jandismommie: What is the best way to clean aquarium decorations? I was given two big aquarium rocks and I would like to stick them in my tank. What is the best way to clean them so they won't hurt my fish? Thank You! Should I just use hot water to clean them? I know you can't use soap. Best answer:

Answer by Wow
You would have to take them out and scrub it with a sponge. Then wash it.

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