Looks like it does the same thing my DIY underbody sprayer does.
Chances are, my parts list costs more than the ready to go gutter cleaner.
Undercarriage rinse tool
4' of 3/4" OVC plastic pipe.
1 Plastic hose shut off valve
1 3/4" PVC plastic street ell
1 3/4" PVC plastic cap
Buy or borrow some plastic pipe cement. (You will only need enough to put 3 joints together)
The hose shut off goes on one end of the pipe, the street el on the other. The plastic cap goes on the male portion of the street ell. Drill three 3/16" holes in the plastic cap. I drilled mine in line with the pipe so I would know where I was spraying. You can now spray off wheel wells, the undercarriage, all those places you couldn't reach before. A side benefit, when you are spraying wheel wells, you can be 4' away and don't spray yourself. (Not that I have ever done that

)
And no, I don't have any pictures. I evidently deleted them from my Photo Bucket account at some time.