A brush that works like a scrubbing pad which is stable on glass with long goosenecks.
The ultimate water fed glass and solar cleaning brushes have arrived. Throw away all of your other brushes for glass and solar cleaning. The Alpha Shifter 310 and 450 brushes are all you need. Shifter Brush V-jets are designed to rinse while brush is in contact with glass (do not lift off to rinse).