Stains on limestone are challenging because it is so porous and absorbent, which results in stains. Limestone looks great, but you’ll have to put in the work to keep your surface clean. You must take precautionary cleaning measures to avoid damaging your limestone when removing the stains.

1. Vacuum the limestone.

Your vacuum can be utilized to care for your limestone, especially if you can turn off the spinning brush. If you can’t turn off the brush, you can still do a quick vacuum of the dust and dirt of the affected area. The vacuum removes and dislodges dirt and dust in between cracks of the limestone.
If you have a limestone table or other surface that isn’t flooring, use a handheld vacuum if available.

2. Use a dry mop or broom.

After removing or dislodging some of the grim off the floors, mop the area. Do not wet you mop, but instead use it dry to sweep the area of unwanted dust or dirt. You can also use a broom for this.
There are several “dust mops” available that would work efficiently for the limestone.

3. Wet the area with a damp rag.

It’s important to remove any dirt particles before using liquids because it can scratch the surface. Fill a bucket of warm water and add a couple tablespoons of mild soap. You can use common hand soap or use a smaller proportion of dish soap. Dampen a rag by submerging it into the mixture and remove as much water as you can. Gently wipe down the area with the rag.
- Take your time and don’t hesitate to spend extra time going over the stain with the rag. Soak the rag as many times as you need to.

4. Try a masonry detergent.

This product can be purchased anywhere that has building supplies. There are different brands of masonry detergent. The benefit of this commercial product is that it is typically faster than other methods. Apply the detergent as directed on the product.

5. Use a commercial poultice.

A poultice is a mixture of ground chalk (whiting) and hydrogen peroxide. Some versions will use a different chemical from hydrogen peroxide. Follow the instructions provided with the product but as a general guide:
- Wet the poultice with distilled water.
- Apply the poultice to the stain or stained area.
- Leave it in place for 48 hours. During this time it will dry. The drying process enables it to absorb into the limestone.
- Rinse it off. The stain should have disappeared.