it,s getting ridiculous, what with all the rain over the last couple of months, plus the christmas break, I'm nearly 4 weeks behind now, and the customers are moaning...
Clean in the rain! I have done this for years now, otherwise, someone may knock on their door canvassing, customer thinks, hmm, my window cleaner still hasn't been, must have give up, ok then, when can you clean?
The new window cleaner turns up in the rain and customer thinks, at least i am getting them cleaned today!
If your that worried, clean them and if they complain, explain its so you can keep up and if all else fails offer them a discount as its rained, personally i never give a discount but then my customers know we will clean regardess of the weather, unless of course its honking it down all day!