Kodak Photo-Flo used to contain an anti-foaming compound that would often leave a waxy coating on anything it touched if the working solution was too concentrated. The current MSDS (2000) no longer lists this compound and gives the ingredients as only propylene glycol and Triton X-100, a wetting agent. Since both these substances are readily soluble in water it should be unnecessary to scrub reels and tanks. A simple rinse in hot water should be sufficient. In fact this is all that I do and I experience no problems.