Won't Miss # 104 - spice and salt caking

Because of the long, humid summer and generous amounts of rain in Tokyo, I always have problems with spices and salt caking into lumps. While I keep most of my spices in the refrigerator, I simply do not have the space to keep everything in it and the result is having to whack the counter with the jars to try and break up the inevitable bricks that form. What makes it worse is the fact that