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You can use muriatic acid to try to clean it but I CANNOT OVER EMPHASIZE HOW CAREFUL YOU HAVE TO BE WITH IT!!!!!!
It's an extremely caustic acid that is used for etching concrete in preparation for paint (i.e. garage floors). If you only leave it on for a few seconds it should clean up the scum.
WEAR GLOVES AND AVOID BREATHING IT!!!!!!!!!!!!!!!!!!
It's sold at Home Depot or Lowes for about $5 per gallon. It's stored outside in the garden area in case of spillage.
Last edited by belkins; 04-30-2005 at 12:34 PM..
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