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Are you sure it is soap scum and not mineral deposits? Even for soap scum I like a cleaner called "The Works" that has phosphoric acid in it, although DO NOT USE IT ON THE MARBLE!! Lime-Away used to be phosphoric acid, but they've switched to hydrochloric and/or something else.

There's also a product called "Clean Shower" that you spray on after every shower. Works slower, but keeps the stuff from building up. There are several similar products. NOT FOR USE ON MARBLE!!

Before you try any of the above, use dishwashing liquid (or other product containing ammonia) to remove the wax from the glass. The chemicals may not eat through the wax. And if it is just soap scum, ammonia may take it off also. Don't know what ammonia does to marble, but it probably isn't good.

If you decide to use the acids, be sure to wear gloves, a respirator, and possibly goggles. Read the instructions, and don't allow to drip on surfaces that may be harmed (e.g., marble, plastic laminates, aluminum).

Better living through chemistry!!
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