The Sky Pro® Window Cleaning System from NuStar Inc. can safely clean a building in a fraction of the time of conventional washing. The Sky Pro is a completely self-contained, self-climbing washing system. Just push the wireless remote up or down to clean. The Sky Pro cleans the entire exterior of a building with water that leaves windows free from chemical and mineral residue. Available in 8-foot, 12-foot and 16-foot models that can be customized to meet any requirements, the Sky Pro cleans at a rate of 35 feet per minute.