Bill;

I think you will find that many glass plates refuse to allow water to sheet on them. That is what surfactant is for. A small amount will go a long way. And, there are 3 types of surfactant. They are Anionic, Cationic and Non-Ionic. Photo Flo 200 and the Tween family belong to the latter. Triton X 200 anionic.

PE