I just bought hemp prefolds from Baby Cotton Bottoms and was referred to wash once, then boil once for about 5 minutes in already rolling water. That, she said, should loosen them and remove some of the waxy substance.
Hope that helps!!
~Jennifer Proud SAHM to Benjamin Michael 07-29-05: and awaiting William Alexander 10-16-07 , married to my best friend 07-31-04 ~