Hi.
Yesterday our window cleaner came and has now started to use a WFP.
I have read up on this system and it sems pretty good.
He spent about 10 mins, I paid him and he left.
A little later I went to check the windows had dried, and I wasn't pleased -
There was dirty streaks on the windows, surely if he was using purified water this wouldn't happen, makes me wonder if he's using normal tap water.
You professionals out there - does this happen to you.