Seems to me if your taking longer to clean hydrophobic glass your not very confident in the outcome so your modifying your technique to compensate.
I used to do this but I've stopped and the results are the same.
DG matey no trying to disagree with you
because in the main I agree
but I find generally if there is any spotting issues its normally been on
hydrophobic glass, now if this product can give a hydrophilic response
whilst cleaning and then drying there is a good chance that it would eliminate
any spotting at all for me.
This affects a small percentage of my work using low tds tapwater even smaller
amount rainwater and when I used pure there were stillproperties I cleaned
that this product would be useful for.
The other consideration for me is weather conditions, on windy days
on busy main roads, hydrophobic glass has given me problems in the past
with the water droplets hanging around far longer especially this time of year
when temps are lower and even when using pure I have had to blade the glass
hydrphillic glass has given me far less problems and again if I can get the
hydrophilic response on glass especially with drying where there its almost
an elastic effect leaving less droplets on the glass would leave me less work
to do.
One technique doesn't always cover all eventualities and if this product
does work I will find it useful.