I have just quoted for cleaning leaded windows with lots of scratches,told the customer that she had to sign a waiver...I took a few pics as well, she was OK about it just laughed it of. Not that I got the impression she would point a finger, nice girl.....but it just wonder if any one uses one or if not I'll just print something simple like " the home owner of 22 smith street agrees that before cleaning many of the windows where scratched and the condition of the glass was quite poor...