You can soak it in bleach and then when all the algae is gone, soak it in water + dechlorinator. H2O2 works too, but not as quickly as bleach. I usually soak mine in bleach and then a little H2O2, then water + dechlorinator.
soak it in 100% excel for a while, then throw it in a glass of clean tapwater. you can do this during weekly waterchanges. you can also reuse the same excel over and over so long as its in a closed dark container.
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