Wow, a real "blast from the past", 2Biz!
That really brings back some memories.
Rtharlan,
The air blowout system uses a Programmable Logic Relay to inject windshield washer fluid/antifreeze into the exposed Foam Brush or Foam Gun after each use (in freezing weather). It eliminates the need for winterized foam brush soap but requires some plumbing changes, an additional
FloJet pump and a reasonable supply of washer fluid.
On a sub 32 degree day, a busy car wash will use several gallons of washer fluid. But, the foam systems won't ever likely freeze again...
unless your air compressor craps out. Don't ask me how I know.