Tom,
It's one of two things:
1. Window contamination
You might have some kind of grease/oil on the windows that is not completely being removed. I'm leaning against this one since you've used so many different products to clean the windows.
2. Towel contamination
The towel you are using to clean the glass. You should have a MF or glass towel (specifically made for glass - check WalMart) that is not used for anything else. It should not touch any wax or detailing spray towels or products. They should also be washed separate from those towels.
I have dedicated glass towels that I keep in ziploc bags to avoid contamination. I wash separately and store separately from all other products since waxes and QDs contain various oils, lubricants, etc.
Stoner's Invisible Glass is the best I've used. Try it with newspaper. Messy, but the best method.
HTH
