I worked outside the teaching profession from 71 to 02. Taught from 02 to 14 before retiring at 60. I never imparted beliefs on the kids unless specifically asked "what I thought of...". I taught the 2 subjects I was employed to teach. Kept things to facts. When I was a class mentor I always put all sides out there as opposed to my own thoughts on a matter. Give them the facts/points of view and let them make their own mind up.

I will admit though that there are teachers who will try to push their own political beliefs. I would add I don't think the "brainwashers" are anywhere near outnumbering the sensible in the profession.

GP - does a Bachelor degree in teaching count as a professional qualification in your eyes. Mine involved not only the course content but also aspects like counselling, discipline, the Law with regard to what you can and can't do/say, psychology and more. Spotting pupils who don't respond to your teaching style and how to ascertain the right style for that pupil. It isn't unusual to have half a dozen different "lesson styles" going on simultaneously and different pupils working at different speeds. Not easy to do.