Do you have one of these? I actually have two and both were almost empty.
I was frustrated trying to figure out how to get the cap off without destroying it. I twisted, turned, yanked and even tried prying it off without any luck. The thought of tossing out a perfectly good pepper grinder sparked an internet search. One of the searches recommended soaking the cap in hot water for 10 minutes. It seemed reasonable, but I wasn't totally convinced that that was the best method. So I headed down through the comments to see what others thought. Some loved the water method, but many suggested using a blow dryer and that's just what I did.
The experiment was a great success! This is what I did,