How to reuse rooting plugs

Guys, what would be the best way to disinfect root riot/easy plugs remove all the organic matter and reuse them for cloning? Got bunch of them with mold and with parts of stems sticking out them. Would h2o2 do the job? I would absolutely buy more, but I am located far in a country side, so the order take a while to deliver.
 
already ordered, but they take like two weeks to deliver :mrgreen: , motherplant will grow new ones by that time, and my current flowering plants are ready in a week or so :/
 
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