How to properly uninstall postgresql?

Question

PostgreSQL

Good day, I installed postgresql, from a certain moment pgadmin stopped starting without my participation, I found the problem and fixed it, but now pgadmin basically doesn’t let me into the database, that is, it doesn’t accept any passwords at all
I suspect that I broke something very soundly
I don’t know , what could be the problem, in Google, on the request "why pgadmin does not accept passwords", solutions are found only by changing the hpg.conf file (I don't remember exactly what it is called) and setting all methods to trust
But explaining the situation when pgadmin simply ignores this file (and I have trust everywhere) and does not let
me into the system, I didn’t find it. I have already made attempts to remove postgresql, apparently at that moment I left a few postgres for myself, in any case, my task is the following:
Erase everything related to postges Install
it from scratch
Windows 10 OS

Answer 1

It is enough to uninstall and remove the data directory (For example C:\Program Files\PostgreSQL\11\data)
Password reset