I love clambering on stuff (other than the steps) to spray on stuff that's above head level. I even managed to jump on the fencing on the second job
My one request for improvement would be that when you highlight an item from the job list (like when you're down to .01% remaining) the flashing effect on the job would be easier to spot.
Oh! And it'd be amazing if there was a hardcore mode where you had to take into consideration how you sprayed
So if you'd cleaned something but then cleaned something else next to it, you'd have to make sure to do it such a way that didn't dirty the first thing all over again. ! It could be like Power Wash Puzzle Mode!
Clean X in such a way that everything is spotless and you don't leave mucky prints behind you.