Dazmondo ive been cleaning with tap water in the 30ppm for over twelve
months now.
This is what I find..New estate properties are no problem especially
where the water sheets and dries evenly,older type semis with hydrophobic
glass can be a problem and if it is bucketing down with rain and there
isn't a tornado blowing through its never a problem.
If in doubt though get the squeegee out
Cant remember which chappie it was but he came out with a idea that
results with cleaning with 30+ tds could very well depend on what the
tds in your water is made up of.
anyways these days im cleaning with lots of lovely rainwater...so cleaning
with tap is DISGRACEFUL