Transmission lines or Sub-Stations located near polluted areas having sulphar, salt, ash, conductive dust, etc face serious problem of deposition of this porcelain insulators. Live line washing of substation, distribution and transmission insulators is often the most productive method to maximize system performance. TGG CO. offers a wide variety of well-proven insulator maintenance equipment to wash all types of contaminant from insulators - in most cases while the lines are still energized. Various types of units - skid mounts, trailers or packages that can be adapted to aerial device equipment allow the users to choose the appropriate insulator washer best suited to the particular conditions. Important considerations in selecting the appropriate options are system voltage, insulator type, height of insulators to be washed, severity of the contamination and frequency of washing, wind conditions and access to the structures.