We use POL to polish the prototype reflectors in our model shop at work. It works better than anything else that I have ever tried. Just found out that it the same thing as Wenol.
WenolŪ and PolŪ Metal Polish - SPI Supplies
I have even used it as the final step, when doing the trigger job on my S&W 686. Now it is nice and smooth. I also polished the finish with POL so much that the gun looks like its nickeled instead of stainless.
I am very impressed with the polish.