When you most likely enter the level for the first time in career your Power Washer gun wont be strong enough to reach the higher places. The trick to not use the scaffolding (multi layered ladders/stars object). I dont know if moving it can break but you dont have to. The worst part is the big building in the back. You can come back later for this if you have another gun or you can do very tricky manouvers and try to get the job done.
This level can be found in Free play -> Locations -> Clean the Fire Station after you have done it in Career,