I have recently started using W5 Blue for trad. I have onbe customer, v large contract, who has asked me back to reclean outsides (2 hours after cleaning) and now just asked me back 3 days after returning.
I have never had any problems before, and when I left I walked around and buffrd all windows with a microfibre and everything was great.
The only difference is I used hot water with these windows as customer has an external hot tap.
Customer states windows are smeared and poorly finished - am off to look in the morning. I have another customer who I use hot water for insides with no issues.
Any ideas?