My customers think more of me if I clean in the rain, it shows I'm dedicated and will never let them down. I usually get massive tips if it's really lashing it down. I do a perfect job too every time - I've never seen any spotting whatsoever although when the lightning flares up I can sometimes see a smear as the glass glints.
You are just a cowboy if you don't clean in all weathers in my opinion
what a stupid thing to say 99% of people would not like you to clean when raining "fact" would you have your car fully valetted in a rain storm "no" beacause its your money, you do not care what your custies think of you but most of us do!
i bet they moan like hell behind your back
paul