They look like type of scratches that could have been done with a scraper but she aint having none off it , is there any type of letter you could send me so that i could pass it on to her cheers kev
Mate i fully understand your concern, i have been there also, but Alex has been more than helpful in this matter in my opinion.
I think now you have recieved good sound advice from Alex and others here, its now up to you approach the lady and to explain to her that its highly unlikely thats it was you that caused these scratches, and therefore if she is unhappy with your services, give her the oppertunity to cancel your services.
Legally speaking it would cost her and arm and a leg to try and prove you put the scrathes on her glass, and almost impossible to prove.
There for stop stressing mate, the balls in her court.
Last bit of advice, dont dump her, makes you look guilty,let her dump you if she wants