If they are really gross I will run an empty rinse cycle. Or run a wash with old towels and rags. If they weren't all that dirty to begin with I just wash like normal. My reasoning is that if all the duck poop and whatnot is out of the towels then it's not in the washer either otherwise my towels would not of came out clean, if that makes sense.Here's a question that I've never seen asked. I have different blankets and towels that go in my duck coop, I wash them in my washer and hang them out to dry. Since then, I've been taking my clothes to my family's to wash. Do u think it is safe to use my washing machine for our clothes still since I've been washing the towels and blankets with duck poop on them in it? My husband thinks we will get duck diseases...lol...I think if I run bleach through it first then it should be fine. Anyone???