I use all cotton or hemp diapers (a combo of prefolds, fitteds and hemp pockets) and just a few poly fleece topped doublers -so mostly natural fibers. I've been washing them with biokleen liquid, seventh generation sensitive (no enzymes in that one) or planet detergent. I sometimes add baking soda to the wash and vinegar and/or tea tree oil to the rinse. Some of them are starting to smell a bit when my DD pees, so I think I am getting some buildup. I'm not sure if I've been using too much lately (maybe so because I got a little lazy and stopped measuring) or just the wrong detergent. I just bought some Ecos to use on our clothes, but I read that I definitely can't use this on the diapers. SOOOO...since I have to get something else for them anyway, I thought I'd see what you all use! Any ideas?? Oh -I wash daily or every other day. Thanks so much! I'm really enjoying this board!