I found a product by chance called 'Bright Shine Metal Polisher' Found it in the car care part of K'Mart of all places. It's a cotton wool wadding in a polishing solution that I have found to be very good on dull or rusty chrome. You rip of small bits at a a time, so it last a while. Mild abravise so leaves no scratches. You can probably get this or similar stuff from Super Cheap Autos.