Summarize:

After the kitten has finished defecating, give its bottom a good wipe to make sure it is clean. Then using a dry towel or another dry washcloth, dry the kitten's bottom as much as possible. Making sure that the kitten’s bottom is clean and dry will help prevent rash or infections. Place the kitten back with his/her litter-mates in the box or cage where you are keeping them/him/her. Repeat the anal massage process with each kitten you are caring for. Make sure that you use a fresh cloth for each kitten. If you used cotton balls or gauze, simply throw them away. If you used washcloths, wash them thoroughly afterwards. Your best option is to wash them in a washing machine on hot with detergent and bleach. Do NOT keep the washcloths in their dirty state for the next time you need to make a kitten poop. Reusing dirty cloths may give your kitten an infection, which could pose a serious hazard to their health. Even though you are placing a washcloth between your hand and your kitten’s anus, that does not mean that urine and feces won’t get on your hands. Make sure that you wash your hands with antibacterial soap and warm water after you finish making a kitten poop.
Clean and dry off the kitten’s bottom when it has finished pooping. Return the kitten to its holding area. Clean up your materials. Wash your hands thoroughly after massaging a kitten’s anal area.