Bees stash pollen and honey in the brood box, but in my case, they'll
relocate or use the honey, and free up room for the queen to continue
laying.  Stashed pollen appears to grow old and not be used.  It looks like
it's a cementous mass and the bees appear not to clean it up or use it, but...

It is my understanding that if you have a frame with mostly pollen, you can
soak it (the frame) underwater overnight, and the pollen will shake out,
leaving you combs the bees can finish cleaning and prepare for the queen to
use.

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