Most metal polishes will work fine. If it's dirty, give it a once over with some fine steel wool before you apply the metal polish. It'll give it a much better shine once it's clean. I've used Meguiar's, Mothers, Rolite, Eagle One Never Dull, and some jeweler's liquid rouge. All work well...but I would have to say that Never Dull is the easiest and mess free. It comes in a fabric/cotton type of wad with the polish already soaked in. You tear some off, and then just apply and buff off with a towel. Your can/tip will shine like mad.