Hi, looking for a good brush for regular work on filthy commercial windows, the window are cleaned every 3 months, it does not matter if the glass gets the odd scratch, as they are 37 years old windows. and and some are 4th floor, so we use gardiners light brush in a stiff variety, and are happy, just wondering if better with a heavier weight brush, especially on ground and first floor, or any methods, even using a standard hosepipe and detergent before rinsing with pure water, as the odd spot or two would not matter
Thanks
idealrob