Full Disclosure: I ride a DF.

I have used everything I could find at REI and Sportsbasement and my various LBS options.
My results were meh - ok.

Then I read about what Bill Strickland had to say about Nix-Frix-Shun. http://cdn3.bigcommerce.com/s-dtb5fy...g?t=1416323792


I have been using it for all fall and into the winter now.
9 drops lasts 500 or 600 miles before I break down and re-apply.
Not a typo, 9 drops. Cleanest drive train ever. Quite too.
The long chains on bents will need more, but use sparingly. A little dab 'll do ya with this amazing stuff.
When it gets to a point where I can hear it at all, re-apply.
Online only, at least where I live nobody carries it. Link to online store: NixFrixShun