Yeah honestly it's the last thing they want to do honest question I bet your windows might be overdue? They should be if you're busy working nonstop lol I've worked I like a dog today had to catch up as I was abroad for a few days my Windows needs a good clean ok fair enough if you've been doing the job two or three years you probably are cleaning them with a smile on your face but the last thing I want to do right now is clean my windows in fact the last thing I want to do tomorrow when I have the whole day to myself is clean my windows I will do them at some point but I'm in the trade now imagine the customer working central London tube please it won't take him long to actually realise what the hell is he doing I can give someone £15 to do this for me and save me a lot of time and do it better than I do it of course.. I tell you what right now I wouldn't mind paying someone £15 lol