Nice game. I pretty much enjoyed it. There's a nice puzzle in figuring out what parts you need to clean and how to do it effectively.
I got a bit frustrated a few times, first when I accidently returned to the garage before finishing the job, and then a couple of times when I thought I figured it out, only to find out that I supposed to clean some more, and I needed to go through the whole level again.
I liked those little details, like when I accidentaly shaved a tree. :-)
Fun. Thanks for the game.