I have always cleaned windows in the rain.....I only stop if it is extreme weather. I realy can't remember the last time I lost a day due to the rain. I havn't lost any customers because of it.
a few occasions a customer will ask me to leave it , but I dont mind, I just move on!
yesterday was realy bad, but I worked , and no one complained. I even picked up a customer.
however , I will point out that I live in south wales , and we do have a lot of rain. our resovoirs are full

stopping because of rain is not an option in the wettest part of britain.