Part of a reply I had from Titan Labs:
Yes, GG-4 changes the properties of water. You’re definitely on the right track, but be careful of the magic potions, you don’t want one that contains surfactants such as those used in dish soap. They will leave a filmy haze and dirt re-deposition is brought on very quickly. GG-4 breaks the surface tension of water, pure or otherwise. How we do that is a trade secret. It stays wet on hot or windy days and leaves the pane sparkling clean. And thanks to the sheeting rinse, you’ll never find spotting a problem.
The fact that you’re using pure water means that most of GG-4’s work has already been done, allowing it to be used in a much smaller dosage ratio. The normal ratio of 500:1 can be lowered to 1000:1 or lower, depending on preference.
Some product information is attached. Let me know if you have any more questions.
Regards,
-Alan