How to Remove Limestone Stains: 9 Steps (with Pictures ...
May 06, 2021 · To remove stains on limestone, you can use a commercial poultice or baking soda for soap scum stains in showers and bathrooms. First, vacuum the area, then dry mop with a dust mop or broom. Follow this by wetting the stain with a damp rag, then apply the poultice or baking soda. Let it sit for 48 hours, then rinse and dry the area.