I wouldn't chance putting GG3/4 through my resin but .....
I know I've brought this up before, but today I re-tried a previous experiment and once again added a small drop of GG4 to my trolley as I knew I would be able to view these windows from the insides after the clean. Some of my old darlings who insist that I come in for a home made cake (made especially for my visit) and a chat and a cuppa. The results are definitely improved. (I can take my time at the moment as it's not my full time job - I just love window cleaning!!! - my full time job stinks!)
I know it sounds contradictory after we make all that effort to get the water to 0 TDS and then I add something - but I closely examined the dried windows from the insides and they were absolutely spotless - right up into the top corners. The water had sheeted well and run off the windows quickly.
There was something different about the way the windows scrubbed too - difficult to put into words but it was definitely there - the water seemed wetter!!. The frames cleaned better too.
Ok - so I've had a whiskey (Grouse - what else) or two this evening but this isn't the drink spouting off. Give it a try yourselves and report on YOUR findings.
I am talking about a very small amount of GG4 - just one average size drop in a 50 litre full trolley. I reckon it's something to do with breaking the surface tension down and allowing the water to spread and flow better.
Maybe I should be using GG3 as the water has been processed but I've only got GG4 and what the hell it seems to work
John