I just got my diapers out of the dryer and they all smell like urine...pretty strong, too. I have been doing a soak in warm water...vinegar with every other wash. Then I wash warm, with biokleen (not bac-out, though). I do a cold rinse, as that is the only option on my washer. I follow with at least one more rinse, usually two. I haven't had a problem until today. Oh, and I dry them in the dryer because I live in an apartment...no place to line dry. I used Borax as a water softener today for the first time.