To keep your luggage platform shiny, we offer these cloths which you wrap around the rods. While pulling the cloths along the length of the rod bars, a back-and-forth motion of the cloth applies the embedded polish uniformly to the metal, resulting in a uniform shine.
In the photo, the polish from the cloths is on the rod (bottom left corner).
A multi-pack of cloths is $12 - part # 200401.