Dave,
You might try the following:
Simichrome Polish by Happich (Imported from Germany, by Competition Chemicals, Inc., Iowa Falls, Iowa 50126], A.G. Russell is also a fan of this polishing paste.
http://www.agrussell.com/maintenance/index.html
which if purchased alone is $9.95 with free shipping. My tube is actually 1.76 ounces or 50 grams, not the 1 1/4 oz mentioned.
I cannot qualitatively compare it to other polishes, but can say it certainly works fine.
I am not sure how it would work on a bead blasted finish. I cut and pasted this info from a reply I made in a Bladeforum post entitled
Help: brass discolored by long-term labels
Another possibility might be the chemical used in Heddy Rust Treatment -Rust Killer & Primer. The bottle notes that it contains Phosphoric Acid. I assume this is the main active ingredient, but do not know what if any other active ingredients are in it. [Heddy Corporation, Paterson, NJ 07524]
It supposedly changes rust into an inert hard substance. It also notes that if excess dry powdery greyish white substance develops it should be brushed off. I know it has worked for me, but I never examined it critically.
Does anybody else have knowledge about this type of chemical, alternative brands, or the efficacy of the reaction?
Donald.