I give them every opportunity, however, to about 90% I am "The window cleaner".
I like it that way, my polo shirts have Window Cleaner in big letters across the back, in case there is any confusion.
I have a sign written van, and all my details on a card, but it is simply easier to just be "The window Cleaner"
It is a two way street, I have no idea who they are either. They are logged as an address and clean details.
It doesn't mean that we don't get on, I have a great working relationship with hundreds of people who's names are a complete mystery, and vice versa.