i have only ever employed 3 lads for temps  1 last a day and was useless,  2nd one let me down on a builders clean  just before xmas, so didnt bother employing him after xmas, 3rd one was ok, but  had been a wc before and was full of bad habits as had worked for a company near me  whos policy was never to do frames,  wear what ever they liked for work,  if they didnt have a pole in there hand then you wouldnt know they where window cleaners,  
the prob you got with this job is any one thinks they can do it, so start up  a lot mess it up and then jack it in, leaving custy with the impression they can get a window cleaners for £4