This is a "sensitive" topic and I will simply add that I prefer to carry TP, baby wipes and sanitizer, but, have often used Thimbleberry leaves and even Bigleaf Maple, when necessary while working in the mountains.
One of the aspects of this that immediately strikes me is the possibility of a hiker's being "allergic" to a given plant or plants and not knowing this UNTIL using the leaves as TP. This could lead to rather unpleasant results and in genuine wilderness, the remote regions of Canada and Alaska, you could be in very serious trouble.
I would be VERY perturbed at ANYONE using a watercourse of any type as a means of self hygiene and while I know this is done, I am strongly opposed to it. You can still safely drink from most streams in BC, especially in our vast wilderness preserves, such as the thousands of sq. miles of the "Muskwa-Kechika" in northern BC and I would like to keep it that way.
For very LONG wilderness sojourns, mine have been an average of 90 days, alone, in some of BC's most remote regions, starting in 1967, I like to have some means of keeping clean that is light, compact and very efficient. A small plastic bottle of beach, a couple of washcloths and you are good to go for months with NO problems of hygiene, health or polluting the environment.