I've went through my customer spreadsheet this morning and identified 53 properties I don't want.
Most of these properties have access issues (garages to climb over and stuff) and not really suitable for WFP.
I've prepared a letter for them, telling them nicely that they're dropped and giving them alternative numbers for other window cleaners; set out in a table with a box I tick for the window cleaner who does their area and who I think they should call.
Out of BADNESS, I'm going to tick Ian_Giles's box on each and every of the 53 letters I've got, so he'll get harrassed with 'can you clean my windows' on properties I know he'll not want. (That'll teach him for the regular thrashings he gives me in the squash court).
(I'll also tick the correct boxes - giving them the right window cleaner - I'm not that bad).