I don't polish my brass, but if you want to clean brass, use Bar Keepers Friend. You can find it next to the Comet cleanser at Walmart. It is slightly acidic, and cleans stainless steel, brass, copper, and aluminum. works great. If you have a stainless steel sink, your wife will love you for it. As a side note, I did clean my brass with WD-40 once, and it caused a dud primer at a critical time when I had an elk in my sights. The only time in 45 years of reloading that has happened.