Sorry, but I honestly have no idea :nixweiss That probably sounds ridiculous, but the truth is I don't pay any attention to the Car Wash jug or the jug of diluted mix except when they're empty. FWIW, I must go through quite a bit; I buy it four gallons or so at a time and I only wash our vehicles.
Accumulator, yes, great lubrication even without the foam gun. In a pinch ,it's good for a quick debugging/removal of Bug Guard just straight out of a bucket.