Originally Posted by Luvs2jump
Never Dull works well and it's safe. You can find it in hardware and automotive stores. I use it on the buckles of my bridle, the d-rings and name plates on my saddle, I love it and it's safe to use on brass.
Here's the link to it: Home Page
I swear by Never Dull, it's safe to use on brass, don't have to worry about it getting on the leather, and will work with getting most of the green stuff off the name plate. I use my fingers to work that stuff loose and then the Never Dull. I use it all the time on above mentioned parts of my tack.
I think you can even find it at Walmart and stores like that too.