How to polish brass?

[Dengue]

Hello, I want to make a highly polished brass button about 30mm diameter. Can anyone please advise on the best way to do this?
is it possible to do it in a way that it doesn't tarnish in future, like the SmartHinge and other highly polished brass hardware that you can buy?

[Master Splinter]

The highly polished stuff will have a varnish coating on it - Wattyl Incralac is what you can get in the shops. Supercheap Auto have - Cleaning & Polishing Set - 3 Piece - Supercheap Auto Australia (http://www.supercheapauto.com.au/online-store/products/Cleaning-Polishing-Set-3-Piece.aspx?pid=272931#Recommendations) to fit a drill.