So what is, and what isn't brainwashing?
Songs are very potent at instilling a message.
Is it brainwashing to get children to sing hymns in school? And line up in the Playground on Empire Day, like we did.

OTOH if we are not allowed to pass on anything which has a message then we are doing no favours.

I suppose we have to teach them to think about what is being fed to them, by the media and by educators.