You can iron freezer paper onto the board (shiny side down). If the smell starts bothering you, just rip it off and iron some new freezer paper down.
Regarding musty smells in fabric, I have found that adding this "kitty litter" powder to the wash load helps a lot:
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
It washes out and takes the odors it has absorbed with it.