At SBM, we obviously use high pressure washers. However, we are aware of delicate surfaces and we utilize a rotary spray device that cleans more powerfully than a regular wand approach. This method is actually surface friendly. Often times when a building is cleaned with high pressure the building is damaged by overly aggressive methods such as micro focusing the pressure washing wand to remove stains. At times, this method actually removes the building substrate. At SBM, we are aware that our mission is to clean the building while protecting its original intended appearance. Please call for a free demonstration.