yes...I think so.....seems to me that the answer is...first time round, clean it all, frames, glass and everything....second visit, just the glass, only going up to the top of the highest frame where it meets the glass...no problem now.
I think what was happening is that in my enthusiasm, I was also getting the brickwork/etc wet.....then it was leaching contaminents in the drips...landing on the glass. Since I stopped doing that, it's been fine......
And all I was trying to do was the best cleaning job I could....steep learning curve...ya know....customers don't want REALLY clean.....they just want VISIBALLY clean........bah, lack of knowledge on their part, coupled with ignorance, discrimination and down right stupidity......the new flier has helped though.....stupid public !