I am a trad cleaner and I don't work in rain, light drizzle yes proper rain no, I have no idea if it would make any diffrence to my customers. I also don't go out if I deem it to be to windy.
It has little to do with what customers want or think, I have worked outside all my life in all kinds of weather, At points in my life I have lived outdoors 24 hours a day for months at a time.
Now I don't have to so I don't