The bus washer shall wash the roofs, sides and rears of vehicles from 90" to 102" wide. The washer shall be vehically controlled on a drive-through basis by overhead dangle and hip switches. The sides and rears of vehicles shall be detergent brush scrubbed by (2) pivoting brushes. The roofs of vehicles shall be drag mopped by a stationary roof mop. Detergent shall be applied by both a solenoid controlled, siphon operated, prewet detergent arch, mop roof washer and brush sprays. Detergent shall be rinsed by a solenoid operated rinse arch.