|Gerry, I don't use it at all now, I only used it when I had a free sample. I use Fairy.|
The main benefits apart from extra cleaning power is the fact that the window stays wetter longer, and you are supposed to get less bleed back on to the glass after squeegeeing, it is not supposed to leave the film on the glass that the dish soap leaves either. When you add the dish soap you get more glide, but I dont suppose the other qualities remain.
When we use a substance in our water it is not to clean the window, it is to make squeegeeing easy, give it glide. I have personally dipped my applicator in a dirty puddle in an emergency, to get that last couple of windows done on a roof for example. These windows were left just as clean as all the rest. It was the remaining dish soap left in my applicator mixed with the dirty water that enabled me to leave these windows clean.
I found gg3 to have the same effect as using water straight out the tap when cleaning regularly cleaned windows. When having to deal with really stubborn stuff on the glass such as smoke on the insides of pubs, I found it to cut through it easier.
What I would recommend to do with it now is mix some up in a spray bottle, and take it with you when needed.