These are deposits of water-borne minerals, body oils and soaps – and any salts or perfumes you’ve added to the bath water – that gather at the high-water mark around the surface. Wiping the sides of the tub down after each use will reduce the need for heavier cleaning strategies. Remove heavier build-ups by applying a heavy-duty cleaner, allowing it to work for several minutes, then scrubbing gently with a white nylon pad.
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Remove any remaining mineral deposits by soaking then scrubbing with a diluted solution of phosphoric
acid, which is an ingredient in many tile and tub cleaners. If you need to resort to this step, wear
protective gloves and ventilate the area properly, since phosphoric
acid is a skin, eye and nose irritant.
Reference:
Don Aslett in The Cleaning Encyclopedia: Your A to Z Illustrated Guide to Cleaning Like the Pros.
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