There are many, many polishes made for musicians to use on their guitars. StewMac is just another of the premium ones made. Martin also makes a good one.
Rickenbacker recommends Turtle Wax 123 liquid (it's what they use at the factory, too). It's only a few bucks a bottle and universally available at auto stores, hardware and home centers, too.
Readers of this Forum are familiar with my Scratch-X/Zymol treatment, which has been discussed at great length and which I consider to be an excellent method for restoring old finishes on Rickenbacker instruments, and which is also a terrific regimen when your guitar or bass needs a freshening.
Every guitar I restore or refin gets this treatment as the final step in finish protection, before I send the instrument back to its owner.
Here's a '66 325 that I just finished restoring for its owner, who has had it since it was new. It is one of only 6 made (Smith), and was purchased new at Manny's in NYC. In these photos, it has just received the Scratch-X/Zymol treatment.



