to be totally honest we've never been busier. I think its probably down to
a - joe public working more overtime
b - joe public not spending as much money down the pub (because he's been scaremainered) and so in effect has more cash to spare and gets his windows cleaned.
c - the commercial sector is desperate to attract custom and so is now spending more money on window cleaning to enhance the image of their shop/outlet.
d - we've all got off our lazy butts and gone out and got more work because of the scaremainering.
then there's also the decrease in mortgage rates meaning home-owners have more money etc etc