We just got a new upgrade to our pure water cleaning brush. Hog hair bristles! Hogs Hair(or boars hair) flattens out on the glass to create a larger scrubbing area and has more agitation than our original nylon brushes.
The using of natural hair fibres, in particular HOGS HAIR, has proved a winner for glass cleaning for many years. The bristles have been packed thick so we get the best contact on the glass .. with 100% Hogs Hair.