put it in a cup of bleach for about 10 or 15 minutes.
Then rinse VERY VERY well.
I rinse the crap out of it, then actually let them sit until I have to clean the other one. I pretty much have two for each tank, that way I can really clean them well and let them sit out for a while.
I do know many who so the bleach thing, some just poor bleach over the disc (if that is the only thing that is dirty) and hold it until it turns white, then run it under the faucet for about 5 minutes, then right back into the tank.
I was shocked the first time I saw it and was sure it was BAD, but they did it for a long time, before I was even keeping plant tanks and assured me it was OK, so I started doing it.
It really cleans out the disc, and the bubbles start flowing like when it was new again.
Anybody have any other ways to do it, I would be interested in trying other ways also.
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