Sorry, Shawn,
That must be really annoying, mate. Is your van signwritten? I mean it's strange someone wanting to steal a window cleaners tools; generally I would think that the general 'thieving' types wouldn't think a window cleaners van is worth breaking into, since I reckon the general perception is that our tools don't cost that much money; and it's such a niche market to trying to sell it on too.
How're you going to sort it out? Insurance? Or are you going to sort it out yourself?