I used a lot of finger rubbing and WD40 getting one off a Browning Citori with a gloss finish. There has to be a better way but mine is off and not a mark on the finish. Patience works and I learned cussing at it did little to speed up the process. I will never put another one on any gun.
This is response from cheek-eez after posing that question. Cigarette lighter fluid is recommended. You can also get products from Walmart for label, sticker and adhesive remover, look for Un-do, Oops or Goof Off. Goof Off on Lowes shelves is recommended for removing adhesive and glue, asphalt & tar or dried Latex paint. If you use some other product stronger than alcohol, you should test it on the bluing under the barrel in an inconspicuous spot; likewise on gunstock finishes. The Un-Do web site will give you good information about their product. Bluing is generally quite resistant and hard to damage.
I just removed a 1/4" cheek eez yesterday for a customer to install an adjustable comb. It took over an hour with the heat gun and my fingers to remove the thick part so I can get down to the glue closest to the stock. Then it took almost a half an hour to finally get the glue off. I used heat, goof off and old english furniture polish until it was clean. There was no easy way to remove this product, just old fashioned muscle power and being determined did the job.. Joe
They are hard to remove but work great while they're on there-especially if you don't have a very fleshy cheek. I just removed a Meadows stick on comb (same material as kick-eez). I had it on there for 5 years and it was getting a little ragged, so I took it off and put a new one on. Lighter fluid and fingers.