Traditional water cleaning system of insulating glass production line is circulation system, the water was drained from the tank by the water pump,sprayed onto the glass surface through the water spray, then go back to water tank after cleaning for cycle use. So called secondary cleaning , add a spacer layer into the washing machine, to avoid glass not clean enough due to cross-contamination . However Parker insulating glass production line has three washing grade, every level with a separate brush as guard protection to prevent cross-contamination, completely solve the problem of glass not clean enough.