Originally Posted by Beezer
I got the [wintergreen] oil from a local health food store, another source is homeopathic medicine. I hear that sports medicine uses it too.
Also (from previous posts):
"With nothing to lose, I immersed them in lacquer thinner and checked them twice a day. The things swell up and you would swear that they are ruined, but they shrink back to normal in a few days. Some guys also use wintergreen available at drug stores and make some sort of brew mixing it with the solvent. I just use the lacquer thinner until the boots soften enough and then soak the boots in the wintergreen for a day. As they start to shrink, the wintergreen sucks in to the rubber. The wintergreen at a cheaper price is also known as Thor Tire Prep #12 and available at kart shops to soften racing tires."