Hi Stuart
I use peter fogwells auto brush which is a salmon brush, i choose this brush because you can turn the water on and off at the brush it, it saves water and power from the battery, but better still i heard it cleaned the glass great which of coarse should be the first reason for choosing a brush and i really recommend it, have had no real problems with spotting and it gets most bird mess of with ease.
I also rinse with the brush on the glass.
Regards
John