Bleach them with a dilution of
Chlorox at 1 :10 of the bleach solution diluted with 9 moreparts of RO/DI. Let is soak for a few days, then put it outside for 2 days of sunlight. No need to even rinse them (but I would to avoid dripping bleach on something), as the sunlight will drivve out the chlorine and help to bleach them some more. You could just display these on your mantle, etc. to ...