I also have Quicksilver monos and I use a product called Never-dull. It's available at auto parts stores and it is made for all metals. It will make your Silver 90s look like new again and it's easy to use.
Rrog (Answers | This Thread)
Ditto for Nevr-Dull. I used it on my Quickies, and it works great. Just make sure they are 100% dust free before you polish.
Bojack (Threads | Answers | This Thread)