I started using them when we had get form up north of the boarder, I have always reused them with no trouble. For the most part we have had a closed herd for 10 years. When we pull them we have one person the just cleans them just as they come out right by the headshut. They get pulled go right in a 5 gallon pail of warm water and cleaned. Then rinse in a second pail. Then dipped in a pail of warm water with NOLVASAN'S CHLORHEXIDINE DIACETATE. Then we dry them off and keep them out of the sun. If we do not have a nuff help we put in a pail in shade and clean at the end of the day, but that is a little hard as the junk has dried. A lot of the time we pull out clean and put back in the same day. I have also kept used ones from 1 year to next. I also do custom AI and reuse them there also but just in the same herd. Took an AI refresher 2 years ago and they said not reuse, but I still do.