Oil them with neatsfoot oil! :) You'll want to do a less than noticeable spot first, just to make sure that the color is right, but it should do the trick.
I'd also advise making sure the oil is 100% neatsfoot because neatsfoot oil sometimes has other oils added in that can cause any natural fibers to degrade, and even though your reins probably don't have natural fibers, you might eventually want to oil something else with natural fibers...
Fabio - 13 year old Arabian/Lipizzan gelding
Rest peacefully, Lacey.
Last edited by Wallaby; 11-22-2011 at 08:54 PM.