If you have an air compressor, a degreaser (I used Simple Green), and the tools below you have what you need. I mixed Simple Green with hot water in the bucket and shot away. Let sit a bit. Rinsed.

Could I have taken the car to a wash? You bet. Just don't like to.

JamesC

Simple green works, but I started using Meguiar's APC+ in the shop and it blows SG out of the water for jobs like that.

What hose setup is that?

The gun hooks up to a compressor and has an input for a hose (garden or otherwise). I don't remember where I purchased any of it, but I suspect something similar is still available.

JamesC

Better shots. Now that I think about it, I may have made the hose portion.

JamesC