Yukkuri will feel Happyness! when you do wipe-wipe after peeing/pooping
Yukkuri are creatures who really like cleanliness. Even in the wild, parents and sisters will frequently lick each others bodies to take of dirt and preserve cleanliness.
Especially after doing poo poo and pee pee, they're really sensitive about dirtiness. After they grow up, they can clean their anyaru and mamu mamu by themselves. But when they're babies, the owner should help wipe them clean. If you neglect doing this, they could grow "yu mold" or the hardening poo poo could seal up their anyaru and give them constipation.
When they're still babies, they still can't clean clean! on their own. Owner should accompany them when they go to the toilet
Warm up a wet absorbent cotton with the microwave for 10 seconds and use it to wipe the affected places. After that, carefully take off the hardened poo with a cotton bud.