A lot of people don't think about toilet paper in a post apocaliptic world: you can still use the toilet for a while after the outbreak, and after that you can go in a bucket, but what will you do after your bog roll runs out. You could steal some, loot etc. then you could use newpaper, books and other paper. But what when its 10, 20, 50 years later, all the papers rotted, you don't know anything about manufacturing it, there are no facilities? i'd like to hear your thoughts

leaves of soft plants like doc leave.
-cormacr9
I think leaves or a small washcloth would probably be used once all the toilet paper has been used
-Powermetallian
I'm sure at least a handful of survivors in each country know how to make paper.
-All-Good
Which one of us lives when 10-50 has gone?
-HellfireRe

Alicestar:
rabbits, rabbits are soft and there abundant here so just use them!

Andy:
Soft clothes: Wash them OFTEN and they will serve you well.

Thrawn5:
Water or wash cloths, leavs work but will get used very fast in a large community.

DETHKLOK_DETHFAN:
Many kinds of leaves can be used. Try to refrain from tobbacco leaves as your ass cheeks will stick together.

Sadakado: I would pick something like a CLEAN washcloth. Never leaves or animals. They could be infected with ANYTHING, and that would cripple your ass. Not good in a Z-day situation.

zooken: The Romans used sponges. If you lived near the ocean you could farm them. Or if there is an abundance of water, you could have a little Bidet action.

AgEnT_GrEEn:
Just go with a drab-colored poop-rag...You can use it to knock out sentries too ; )