Not had that happen, but going back a couple of years I had a customer who was a Lord, and both him and his wife were killed in a road traffic accident, after a few days there daughter phoned me and asked if I could go along and clean there windows for the funeral the next day.
So off I go, when I got to the property I discovered they had been burgled
I quikly phoned the Daughter who unknown to me was at her parents solicitors at the time of the call,
she went almost into shock, and behind my back to the solicitor started to accuse me of the burglary,saying all wc are the same, but she was soon put right by the solicitor,
when he found out who there window cleaner was.
The solicitor told her in no uncertain terms that a lot of window cleaners are tarred with the wrong brush, and that he could vouch for this paticular window cleaner, as I was a member of his family
and that I had represented the security trade for over 15 years.
I recieved a full and written apology from her with a cheque for £100 to say thank you, for cleaning her parents home for the past six years.
I almost sent the cheque back out of pride, but after a conversation with the solicitor I decided to keep the cheque and enjoy it.
One thing that I do now is carry with me, (and wouldn't be a bad idea for you guy's to do the same) is crime prevention leaflets,
If I clean a customers house, and there not home, and if they have left any downstairs or easy accessible windows open. with my windows have been cleaned today ticket I attach a leaflet and post it into the customers home, Letting them know about open windows, some of them take no notice but its supprising how many do, I even take it on myself to close the winows over so it just looks closed.
I have seen over the years the stress and trauma it has caused people, and now being a window cleaner I don't want to be on the list of suspects.
Make an appointment to see your local crime prevention officer and explane your trade, and the amount of windows you see left open, they are more than happy to give you a bundle of crime stopper leaflets and some helpful advice to give out to your customers.