I was really tired of the garden hose getting stuck under the tire while washing my car so I looked around online and found "Hose Slides" on Amazon. I didn't want to pay $15 for a pair, so I designed my own version in Fusion 360 using a guesstimate of the measurements. I made a couple of changes, like a lip along the bottom edge so the hose doesn't slip under the guide and a thumb-hole...for your thumb, because...um...well, because I just wanted to add a thumb-hole.

The original scale works best on smaller wheel/tire setups, like 15"-18" car tires. For larger tires you may need to scale the model up some.