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That is a tough one.....since it will soak up whatever you put it in.
You could use hydrogen peroxide, that should kill mildew....and will breakdown to a harmless substance. Soak it in your bucket with hydrogen peroxide full strength would be best (from the grocery store or walmart, not an industrial supply) Where did this rock come from?
You could also try boiling it. Put it in a tub and keep pouring boiling water over it, that would surely kill anything. The trick will be keeping the water hot enough to get that boiling water all the way through it.
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