The most effective way of un brainwashing people is to show the truth via evidence, without commentary.
Simply: put the evidence down and walk away.
It is simply not possible to actively change someone’s mind.
It’s not possible to ‘unbrainwash”, as an intention.
There is simply the information.
However, people will never take the pill until they are ready. The best people can do is to keep putting the information out there with good intentions and hoping or knowing that people will come to it in their own way eventually. Please remember, there was a time when people were “100% certain” cigarette smoking did NOT cause cancer. Those that knew otherwise kept putting the information out there and eventually the strong marketing and legal maneuvering of big tobacco could no longer compete with the raw, and eventually plentiful, data showing otherwise.
Real Big Money: Revelations by an insider Ronald Bernard
'DVM-TV' video production: interview with insider Ronald Bernard, by Irma Schiffers