After a bowel movement, wipe clean then wash with soap & water. dry off. Wash with a decent amount of hydrogen peroxide and let stay for 2 or 3 minutes. Wash again with soap & water. Dry with towel. I also use a blow dryer on cool setting to get all moisture dried.
I read somewhere that bacteria can get embedded in your skin and all the soap & water in the world will not remove it. The peroxide can get at the bacteria. It's a simple solution and easy to try. I just hope this can help others suffering with this problem.