QUESTION:

I am trying to clean some very old cast limestone accent bands on a building. The stain is black and I have been unable to remove with pressure water only. Do I have any options?

PICTURE:

SOLUTION:

The option that we would recommend would be to try BioKlean by PROSOCO. The picture above is a sample that was done using BioKlean and a cold water rinse of 1000lbs. This section of stone had previosly been washed with hot water at approx. 3000 lbs. pressure. After cleaning to satisfaction, we would recommend to minimize future staining that you apply Weather Seal Natural Stone Treatment by PROSOCO. This is a modified siloxane product that is breathable and will only darken the stone slightly.

SUPPLIERS:

www.prosoco.com Link to the service provider page