Had house that we did it had certain hard water staining on most of the windows?
This is nothing new as it was about only on the glass about 4 months worst was where the sun had sort of baked it on.
We use One Restore to remove it.
Windows that were the most in the sun the hard water came off.
But on closer inspection the hard water was impregnator into the glass.
These windows we then had to use CC550 which remove these stains.
But why was this?
House is only 4 months old even if they hosed the windows using bore water which this house has to water garden it would come off fairly easily.
So asked the owner if they had hosed the windows said no (BUT.)
They said the painter cleaned the window frames and where they had to paint.
As there was a lot of dust dirt grit etc on them.
Using a pressure washer which would of forced the hard water into the glass impregnating into the glass.
The very worst windows were when we had a heat wave +100 F directly onto the windows.
Just a side note the owner also said the painter was going to clean up the windows.
Well this did not happen in fact they have not come to finish off the job yet.