I used the smaller version when racing. They dont work well on thick claggy mud and are slower than a pressure washer, but cheap and get the job done, and don't ruin bearings.
A brush and a sprayer and job done.
Yeah, I thought about one of those but I'm trying to make the cleaning as fast and painless as possible - so I actually do it. I'd also use the powered unit on the car and I'm not worried about shooting it into bearings or anything - my aim is still good :)
You could try something like this at a fraction of the cost.
http://www.diy.com/departments/verve-pressure-sprayer-5l/191247_BQ.prd
I used the smaller version when racing. They dont work well on thick claggy mud and are slower than a pressure washer, but cheap and get the job done, and don't ruin bearings.
A brush and a sprayer and job done.