Don't know that was the last window - the place was swarming with builders. Some prick fired up the stone cutter as I packed my kit away 
I just love those type of jobs when you are into the clean then some numpty comes along and starts creating poop loads of dust... Why the fook am I bothering springs to mind 
Err...because we get paid. If I believe what people post on here most are on £40 per hour plus.
No dd I'm not on about what you get paid but can get very disheartening at times when trying to do a good job and someone comes along that can potentially fook your job up that could lead to complaints through no fault of your own.
Like people have already mentioned it's not just builders creating dust but groundsmen too with fooking leaf blowers etc. Not to mention road sweeper on dry days.
The worst one I was in an middle of a clean on a new build and some numpties decided to dig up the road close by the property to lay new pipes then the backfilled the trench which caused a dust storm that covered the property I just cleaned... Now that really peed me off and the client too.
