Re: Moldy smell in Old Railway Equipment Registers
My wife would say set it in the sun for a few days. IE let the UV rays kill
off the mold/mildew. She also sprinkles cinnamon around the corners basement
to remove the odor.
Google can help: http://www.wikihow.com/Remove-the-Mildew-Smell-from-Books
which has a caution about using those dryer sheets.