i just wouldnt put it, too personal perhaps? card a place where theyve got a window cleaner and they tell them/show them your card. i know it doesnt happen often but you can upset people
jealous people, people who want you out. theyll all know where you live and where you equipment is.
just something i think thats all, its up to you. im not speaking from experience, as we dont get it round here, but ive heard stories of other window cleaners threatning. vandalising