This slate shower badly needed restoration. The property manager of this vacation home had literally called 30 different companies to try and correct the problem. All of them failed. The shower had been sealed with concrete topical sealer. Any ordinary chemicals that the cleaning companies used just made it worse and only etched the topical.
The problem was corrected easily. A simple task without machines was used to produce a better than new finish. Advanced Stone Restoration, part of the Stone Repair Network, performed the required duties.