A brush that works like a scrubbing pad which is stable on glss with long goosenecks. It is designed with high quality polyester and nylon bristles (not cheaper polypropylene).
These are must have brushes for any serious window or solar panel cleaner!
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.