What is a good polish for black acrylic?

I agree with the suggestion for Novis.

The only other cleaner-polish that I feel is equal is ROR. ROR stands for residual oil remover and is designed for cameras and high quality optical products. NASA uses this and treating a high quality camera lenses will actually delivers MORE light to the film (or digital pickup).

Link to home page if you wish to learn more. I have been using this and Novis for many years and love both products. The neat thing about ROR is it removes all traces of previous treatment without harm.

http://www.ror.net/

Well, for starters I used Google and found this:

http://www.noscratch.com/novus/

If you don't want to wait for it to be shipped, I've seen Novus for sale at upscale hardware stores, a few Home Depot's, almost every Container Store and many plastic's supply houses (look in local Yellow pages "Plastics").

Here is a link to the Container Store page with location listings. With luck, you live near one.

http://www.containerstore.com/find/index.jhtml;jsessionid=AFV0JG00V3RQJQFIAILSM44AVABBQJVC