Yep, here in the south we like to BBQ our wild game for sure, but our rubs and spices don't like the humidity and can often gunk up, even the ones in the glass bottles!!! BUT! there is a remedy....
No need to throw away gunked up goodies when you can fix them with a bit of 225 degree heat for about 30 minutes. Either in the oven or on the grill. You can do it with them by themselves or while cooking a meal. The grill is a little more fun, and smells better as I'm cooking as well.
After the 30 minutes, I put them in my coffee grinder or my wife's smoothie maker, which ever on I run across 1st...
All done ....
BTW, the Shifty twins will be joining us in TX for the two weeks.... wish us luck!