We have a Triton shower unit above the bath and over the course of two years, in wiping the front of the unit after use, all the lettering of the controls has vanished. Is there anything on the market we could put back the control lettering, maybe like adhesive letters which are waterproof? I did ask Triton, but they shrugged their shoulders more or less...... You would think that permanent lettering which stands up to general cleaning would be used in the first place.....