My wash had foaming tire brush when I bought it. It took me a while to get it working well, but with help from forum members it works good now. It gets a lot of use. A few things that made it better through trial and error:
- Metered solenoid valves for both air and chemical (originally only chemical was metered)
- Standard length foam brush handle (originally had 3 foot handle packed with plastic netting - Now I use about a foot of plastic netting not packed tight)
- Round Erie Foam Master Nylon Brush Head KR EB219620 (previously used the square Erie Wheel Wizard)
All of these changes helped to improve the tire brush, but the biggest improvement was switching to the round brush. I might not have struggled to get it working well if I had switched to the round head earlier. The wheel wizard adapter and brush seemed to make the chemical and choke and spit. I haven't tried it on spoked rims, but I think it would do a good job on them.
I took a video of the brush in use and posted it on youtube
https://www.youtube.com/watch?v=P5hzzJRarNo. Hope it works, first time posting to youtube.