Will Bleach Damage Limestone. Use lacquer thinner or acetone. Clean mildew stains from limestone with a mild bleach solution. Apply the solution to the limestone with a scrubbing brush, cloth or sponge.
Using bleach on limestone you must dilute bleach completely so that it doesn't damage your limestone surfaces. Do not use soap that contains ammonia, vinegar, bleach, acids and other harsh chemicals commonly found in household cleaners to clean your limestone. Using bleach on limestone you must dilute bleach completely so that it doesn't damage your limestone surfaces.
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I have a leuters limestone coping that is crumbling away, breaking down with little fissures and a general deterioration of the stone. To remove stains on limestone, you can use a commercial poultice or baking soda for soap scum stains in showers and bathrooms. Please, please, please do not use bleach on any form of natural stone. To use it, mix 118 ml (1/2 cup) of bleach with 3.8 litres (1 gallon) of water.