yes.. wipe it dry right after you play it... or take out the mouth piece, polish it with brasso, then with tooth paste...
the best thing is.. .. clean it , wipe it dry immediatly after you play it.
the other polishing compound. AUTOSOL is also extremely good.. .. it is like a toothpaste. . squzz some on the metal surface and then rub it with finger, you will see the white color AUTOSOL become black.. then use tissues to wipe it clean .. .. repeat the sama process until u see the metal has become like new.. then clean it wilth mild detergent and water.. .. as AUTOSOL might not safe when swallow.