BioSonic General Purpose Cleaner plus Super Rust Inhibitor. The new BioSonic UC31 General Purpose Cleaner combines cleaning action with corrosion protection in the ultrasonic bath. BioSonic UC31 comes in easy-to-use unit dose packets that make 2–4 liters of solution each. The concentrated liquid readily mixes in cold and warm water. No stirring is required. The dispenser box contains 20 unit dose packets. Makes 76 l of solution total.