We can clean roughcast, brick, stone, slates, precast stone or any concrete products. The area is sprayed with cleaning solution which kills all moss and algae and prevents it from growing back. Once the cleaning solution is applied, we spray lightly with water to rinse off. No high pressures are involved, which means no stones or shells are displaced. Roughcast and stone cleaning is a much cheaper and cleaner option than painting. If you do not remove the red oxide, this will always come through after painting your roughcast. Red oxide must be removed.