we clean all weather. first cleans, one off cleans, regular cleans, domestic cleans, commercial cleans... have done since we started.
never really an issue.
a few of our reviews even mentions what a great job we did cleaning in rain
how can you be reliable if you stop cleaning in certain weathers?
i would always call this customer and talk it through with them and explain to them. its just the professional way to handle it in my opinion.
saying that if i was a one man band i might not bother either cleaning in the the rain or bothering with people like this. i;d just charge more and ignore them