@drstratton congrats! 13... That's SO many! My biggest ever litter was 14+1 stillborn. So that's really getting up there!
@Compost King Most things that are safe for animals are safe for bunnies. White vinegar is probably the safest. A dilute bleach solution that you then rinse off is totally safe too. Same with good ol dish soap and a good rinse with water. Or Simple Solution/natures miracle/other "pet" cleaning solutions. Unless they're chewing on what you're washing most cleaning solutions are safe as long as you allow them to dry thoroughly and/or rinse them off.