I don't have Oxine either. Mine get soaked in dishsoap & bleach in a tub of hot water for an hour or so, rinsed well & air dried at least overnight. Never leave your bator where chickens can reach it. They are known for eating styrofoam. I rarely wash the lids on mine simply because nothing ever touches the top. If I do need to clean it I just wipe a rag over it with warm water with just a few drops of bleach added & then wipe again a couple times with clear water & air dry.