I found, at my local motorcycle shop, a metal polish from Pro-Honda. If you're trying to clean up you're bike this stuff will work on aluminum, stainless, painted metal, & plastic. It did a number on my airbox and I wasn't really even trying to work it. Anyway, if you're looking for the right stuff that's my recommendation. Incidentally, it costs about $5.50 / 2 oz tube.
Now if it would only work on my carburators.
