https://blog.nationalgeographic.org/2010/04/16/toilet-paper-...
https://blog.nationalgeographic.org/2010/04/16/toilet-paper-...
I haven't used an actual bidet in a while, but I honestly find it hard to fathom not washing my butt after pooping now that I've started doing it.
TP is just smearing it around...
The basic method is to keep washing it and rinsing it off and then washing off my hand, until I no longer feel poop or anything resembling it on my butt. Be gentle. No soap on the butt, that will dry it out. (As I mentioned in other posts, I don't use soap anywhere besides my hands.)
I then keep washing it, occasionally washing off my hand. When I can rub my butt with my hand it comes back not smelling like poop at all, I consider my butt to be clean.
If you look at animals, they do something similar, though they have to lick it clean. I consider myself very fortunate and blessed to not have to do that. :)
Afterwards, I wash my hands, get dressed, and then wash my hands again.
After you're done wiping as thoroughly as you will, run your hand or another piece of toilet paper through your butt and smell it.