I just attempted to let just a little air out of my rear tires on Kubota L4610 to maybe soften the ride and improve traction in sand. With the stems at 12:00, I pressed the little Shroeder check valve thing. I expected CaCl, but was greeted by a kind of yucky brown frothy liquid. Not really salty tasting, but almost more like a spoiled marinade for steak. Rimguard or something else?