I have a Jim Coleman pump stand and at one location and in only one bay, there is a small amount of soap when you are using rinse. I tried removing the soap, presoak and wax injection lines, but even then there is still some soap in the water. No soap in the rinse tank, it's completely clear and this only happens in that one bay. I even removed the tire cleaner to make sure it wasn't seeping into the rinse and still the same. Anyone know of how else soap could be getting into the HP rinse?