I feel your pain! I loaned my nb GMD prefolds to my aunt who was interested in cloth after I cd'd my daughter. I was expecting my 2nd so we specifically discussed that I needed them back in a few months so she would have to buy her own if she liked them... Well, apparently she did NOT like them bc she used them, then let them sit for a while and then her washer broke! By the time I was due she still hadn't washed them and (even though I told her that I would just take them dirty) she tried to wash them. I had given her directions at the initial loan but she didn't remember NO BLEACH!! She actually used so much bleach that it ate holes in most of them and I can still smell it 8 months later.
So sad, but a lesson learned, for sure.