Are cloth diapers sanitary? What about second-hand cloth diapers?
In a word, yes. Cloth diapers and made to be washed and re-used over and over again. Diapers don’t need to be sterile, just clean (disposables aren’t sterile, either). Of course, one should wash second-hand diapers in hot water (some people feel more comfortable if they add a capful of bleach to this) and dry in either the dryer or the sun before use (both of these kill bacteria).