Normally, hot water washing and thorough rinsing will leave your diapers sanitary.  Of course, common sense prevails—a health nurse phoned to tell us her concerns about rinsing diapers in the toilet.  She explained that if the toilet is not kept reasonably clean, it is better to use a separate bucket for rinsing diapers.  Apparently some of the homes she visited had very poor housekeeping habits.  The biggest cause of diaper rash is simply leaving baby in a wet diaper too long, so that the rash-causing bacteria have a chance to multiply in the warmth, darkness, and dampness.  If you are in doubt about the sanitation of your diapers, use 175 ml of vinegar in the final rinse.