Mark VII choicewash Tri Foam question

[gomerpyle]

The tri foam on the drivers side is not applying very well. How/where do you make adjustments to try and fine tune the water/soap/air mixture?

Thanks
Tom

 

[chaz]

Check for leaks, clogged (small) check valves or need for new scrubbing pad stuff in tubes first foam or maybe clogged holes where product dispenses