a good question that
i wouldnt mind knowing aswell
just been out collecting and some1 just asked me why 2 windows are still dirty (down and up-stairs under the BBQ) i explained i spent 5 mins on each window and i had no joy because of the grease
they understood
then i called on some1 else, who said £11 every other month was too much for her 4 bed house with conserv (dont do 3 windows at rear because cannot get to them), so she canceled me
, been a bad night really