I have noticed today whilst cleaning a couple of house's facing the sea, that due to the sun drying the glass at a much faster rate - I have been getting some rather nasty streaks, that look like sea salt.
I have a feeling they have leached out from the double glazing seals.
But no matter how much brushing , and rinsing I do - they was always a streak on the sun facing windows.
The only cure for me was to redo the glass again, and then they were OK.
Has anybody else come across this, and what was your solution?
But Hay - bloody lovely to be out cleaning in the sun.