Reach and Wash, also known as WFP or Water Fed Pole, is a system that uses de-ionised water pumped through a lightweight telescopic pole to a high quality soft filament brush head. The brush dislodges any stubborn dirt which is washed away by the jets of water. The pure water left on the windows then dries naturally leaving a perfectly clear finish. In order to protect and preserve that pristine finish for as long as possible we recommend treating the surface with a sealant. Resiblock is the number one product on the market for this application.