If toilet paper is no longer available is the three-shell-method the best option?

Question from Dup:
If toilet paper is no longer available is the three-shell-method the best option? If not, what would be?

Answer from Bast:
I was taking a pee today and thinking about that damn three sea shell method today! The Romans used sea sponges and these are one of the best methods as long as you have a way to clean them up after. You don’t need to stock up on the type from the sea but you can get your hands on many now for cheap.
If you go with leaves in the wild just know your ivys, oaks and sumacs!