soak them in donkey urine for one week and them leave them out to dry on the evening of the 26th day of the 8th month. after they're dry, place them in a zip-lock bag and put them in an envelope and mail them to yourself.
they should arrive in the mail lookin tickedy-boo.
j/k
i used soap and luke warm water to clean mine. they came out pretty nice. try some bleach. i cant see why it would hurt them.