Rustyiron
Super Member
The "bubble brush" syatem is all low pressure and seperate from the high pressure side. That get's a little complicated for a home system. There was a tank for all the chemicals to mix in and depending if it was H.P. (soap & wax) it got injected @ the pump. The other low pres. items (pre soak, bub brush, and spot free rinse) were dispensed through a air operated diaphram pumps. I'd just go with a bucket of suds & a good hog hair brush. Check that link I posted, they may have a simple foam generating system, and it's not rocket science but you could prolly come up with some system with reg. street pressure water siphoning out of a soap bucket. Getting that frothy car wash foam brush result may take a little air also. It's been over 20 years since I had that wash and the details are getting fuzzy.