I'd say about once per week but I have to use a razor blade, the magfloat doesn't cut through the stuff that's there. The magfloat will keep it clean if I do it every day, every 2-3 days at the longest. After that there is stuff that won't come off without the razor blade.
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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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