He was in, knew you were there and you didnt ask him to close it ?
Unless it's a sash window that I can't push up, I just close the windows with my brush. Have done for years and never had an incident.
It's quicker than waiting for a customer to do it.
And I'll just keep on doing what I've been doing. Slacky's incident is a freak of nature and isn't something that routinely happens.
I do too. ( well, on repeat cleans and properties I'm familiar with if nobody home )
Sometimes though the hinge's are stiff and its not simply a case of pushing closed with the brush.
If I had to tap the bottom of the frame several times with the brush to create enough force to close it , I'd probably think twice.
I'm not suggesting Slacky has btw but that is one way I could envisage a pane of glass smashing.
I have never done a first clean for someone unless they were there. Wanting a first impression to count I've always viewed all the windows first and insisted they are all closed. I'm not understanding why he didn't , thats all.
Of course, they have completely over reacted and are trying their luck at compo. But I can understand them being upset to a point.
Seems Slacky has done all he can to be reasonable and accept responsibility.
My neighbour has just had some rendering work done. Last week a guy on the scaffold dropped a chisel bit on her neighbours car windscreen and shattered it ! Cars owner laughed it off though - accidents happen. Within hours a firm was out and had replaced the windscreen with a £500 bill for the builders.