Things You Will Need
The best way to clean up copper deposits is with a toilet bowl cleaner that contains sodium bisulfate, according to the Experimental Chemistry department at Western Oregon University. Unfortunately, the problem will keep coming back until you replace the offending pipes.
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Apply the toilet bowl cleaner to the blue area.
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Allow the cleaner to sit for the manufacturer-recommended amount of time, which is usually 15 minutes.
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Scrub the blue stain away with your scrub brush.
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Rinse the area clean by wiping with a sponge soaked in water.
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Repeat steps one through four as necessary.
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Towel or air dry.