Found a substitute for Glass Wax
After discovering that Glass Wax is no longer produced, I went on a mission to find a substitute and found it in the garage. I sprayed Meguiar's Quik Wax on a paper towel and wiped down my patio door windows. Very easy to buff off (no dusty residue). So far it seems to keep the windows cleaner than with cleaning alone.
I will next be trying it my kitchen appliances, in an attempt to replace the old Jubilee kitchen wax that has also been discontinued. I am very optimistic with this stuff!
I am sure any other brand of the "spray on" detailing waxes would also work.