When washing cloth diapers and dealing with thrush, I have found that
rinsing the diapers and extra time in HOT water and then one more tme after
that with vinegar in the rinse water.  Also, putting about one cup of
vinegar in the diaper bucket with wtare to soak the diaper in between
washings seems to help.  Dyrers also help a lot.

Nancy in Perth- mother of five- all long out of diapers