Hey guys As most know I don't window clean yet. But just sitting in hospital car park and a van pulls up and whips his hose and carbon pole out. He switched the water on and cleaned 12 ground floor windows 3ft x 4ft and a set of doors in about 90 seconds. Yes seconds!!! He gave them a tiny squirt with water and a quick up and down with the brush whilst rinsing it at the same time as brushing. In his van and taken off. I'm watching the windows as I type. They are drying completely spotted like someone had a sprinkler on them a few days ago. It's very sunny on the windows but this should not cause an issue right? Just wondering why they are so spotty? As I require some tips for when I start just curious what's wrong here? By the way just glass didn't touch 1 grey aluminum frame except accidently with the brush sides. Cheers guys Ps looks f*****g awful.