I dont think it is brainwashing but a form of hypnosis which causes one to ignore things they are told not to see... you see it alright, but your mind does a song and dance and tells you to ignore it and you move on to the next thing without remembering what it was you just saw.... in the mind of most of us things that bother us echo over and over again until we resolve them... to the hypnotized they are just filed and buried under do not open boxes....
I saw this first hand when, while recounting all our JW doubts, post exodus, my now ex wife had a sudden memory surface of an elder trying to molest her.
when she broke free of his grip and left the house, she told her self that THAT DID NOT HAPPEN as she had just expeirenced it and buried it and never ever looked at it again until the moment we found it.... and then she became enraged and vengeful and desirous of retribution... she spoke to her dad, a fallen elder but still connected and got this elder to step down... but before she could get her revenge or at least an apology, this very old one died.