Cleaning soap scum from pebble shower floor
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I need ideas for cleaning soap scum from a grouted pebble shower floor. The grout sealer has kept the scum from sticking to the grout, but the rocks are grungy. I've tried all commercial preparations I can find, as well as vinegar and baking powder, but they don't penetrate the scum.
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Try vinegar with baking soda to make a paste. Spread it on and let it sit. Then scrub with a brush.