Thank you for your insight! I do think washing with water would be ok and that's a really good point with the bleach solution, I hadn't thought of that. There's not a requirement on date (since we have less than 249 hens), which I thought there would be. But I can't reuse cartons unless we obliterate any of the original markings (brand, grade, date, etc.) That is my next problem...I don't want the cartons looking bad but buying new empty cartoons for 50 cents each seems silly to me... I might have to get creative!