Most of my older customers seem to detest window cleaning in the rain, even drizzle.
I have said that if they are not happy I'll re clean for free but most of them say come again when it is dry. boo hiss. Alot of my customers are of the younger generation and tend to be more than happy for me to carry on. If it is really belting down then I'll call it a day and go door knockng or try and get some gutter cleans in.
I have recently changed over to wfp and plan on cleaning come rain or shine.