An Ideal Home trial describes using an extendable brush and squeegee to reach outdoor glass with a controlled water supply.

Bring the water to the brush

The tested tool connects to a garden hose, sending water through the brush head instead of requiring repeated trips to a bucket. An on-off valve helps control the flow, and the writer reports removing ordinary dirt and bird marks without adding a separate cleaning product. The squeegee attachment then removes the water from the pane.

A Telescopic Hose Brush for Exterior Window Cleaning

Do not ignore weight and reach

The writer found the fully extended brush heavy and acknowledged that it did not comfortably reach every upper window. That limitation is more useful than assuming a long handle makes every high window straightforward to clean. Judge the actual reach, handling and condition of the glass before starting, and use an appropriate professional service where safe access is not available. The reported savings belonged to the writer's circumstances, not a guaranteed result for every household.

A Telescopic Hose Brush for Exterior Window Cleaning
An Ideal Home trial describes using an extendable brush and squeegee to reach outdoor glass with a controlled water supply.