Turn flow rate up to a higher setting, makes you quicker on the glass, and i find it actually saves water.
Also never rinse frosted glass, as spotting wont be an issue.
I have found switching to fan jets has sped me up (some may not agree)
Txt the night before for gates to be left open.
I have recently bought a few buffing mitts, as used for polishing cars, i slip one on prior to rewinding, as it will clean the hose off automaticly, again saving time.
If i think of anymore things i will post