[GB Window Cleaning]

I'll also add, If your water is 000ppm and you brush the glass and rinse well... Leave the rest to the gods and carry on! 

[Jonny 87]

Ah nice one.

Glad it all worked out in the end!

I had some windows like that, then I realised even when I traded the glass the marks were still there.

I figured I was examining the glass much more than customers ever would.lol

Nose to glass with the sun at a perfect angle.

Glad you didn't let it get to you and go back trad.