I thought there was detergent in them but maybe there are some that do and some that don't. Googling for more info I came across this - http://reefbuilders.com/2009/03/03/magic-eraser-clean/
Ok, so people are using magic erasers in their fish tanks.  mind = blown.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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