Yes, chlorine bleach. The same as for clothes. Use 10 parts water to one part bleach. As long as the concentration of bleach doesn't go above 10%, and you don't keep it in there long, the moss will survive. It is my least favorite way of preparing moss. I really don't like using it with moss.
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! Myself would not microwave the rocks. It might hurt the moss and there are bugs that will survive it
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