Zerorez is a WoolSafe certified service provider that uses their green, chemical-free Zr Clean for cleaning wool carpets. They follow the international cleaning standard to maintain the warranties for wool carpets. Zerorez lowers the temperature of the water to prevent damage to the fibers, avoids aggressive agitation, increases dry strokes, and uses fans to aid in drying the wool carpet. They also check the carpet’s backing for jute or other cellulosic materials that can cause browning and shrinking.