hi all new member here. Been a window cleaner for A number of years, building a good round etc and have for many of those years been using a combination of supplies but always stuck to one detergent glass gleam 4. Currently use ettore medium rubber and micro fibre cloths, unger bucket, extension pole if needed and BOAB. It was recommend to me by a fellow cleaner who's round I brought off him again a few years back, basically I'm wondering if by sticking with gg4 I'm missing out on something better or better still cheaper? Normally I use a small amount anyway so it's no big deal but the other day wind knocked over my bucket with zero gg4 in the car (my fault) I asked a customer if I could use some of her washing liquid (fairy pomegranate I think) to clean her windows and her daughters as they were the last to be done that day. Found there to be no difference once detailing was done, no streaks etc. So is gg4 worth the money or have I been scammed all these years? What do you guys use gg4, unger or bog standard washing up liquid to good effect? Need to buy more very soon. Any advice?