AW Services
Well-known member
- Messages
- 4,045
- Location
- Devon
I never have a problem with cheap or premium washing up liquid. Due to the larger surface area of a big shop front window the dwell time has to be shorter as the water soap solution dries quicker. Also there is a large percentage of hydrophobic & hydrophilic glass which makes a massive difference to the overall finished job in my opinion from experience and trial and error over the years