Plus im using hot where its between 60 -65 degrees c at the brush end so the bristles are really soft. Any dirt thats trapped would easily disolve and then like you mentioned there is a constant flow of water.
How would hot dissolve grit ? (roll eyes) at the end of the day even if you had a piece of grit stuck in the bristles and it did scrape
the glass then the scrapes would be consistent with the movement of the brush, as you brush up and down the glass then they
would follow a similar pattern, if this isn't the case then its nothing to do with you end of.
Just to be clear you are 100% to blame for putting your foot through your customers roof rotten or not, its your job to check
if the roof is safe enough to walk on.
2 points, i didnt say disolve grit but dirt! and that i have soft bristles so the bristles arent to blame, no dirt in bristles and flowing water to rinse the dirt out.
2nd the roof, sorry buddy i aint no roofer and unless i have my damp detection device with me there is no way of knowing what lays beneath the felt. There wasnt any puddles nor dips in the roof and by all accounts visibly safe to walk on. Which the most part it was, until i went across to the next window and foot went it. But from the piece that came off and the remaining boards which were visible it was clear to see how bad the roof was
On top of that a qualified roofer also supported this, hence no charges or bills put to me!
But as far as the scratched glass is concerned, im not concerned anymore....simple as.
But cheers for everyones advice