Brainwashing is not as fun as it sounds. It involves using various tools to eliminate all knowledge, self-esteem, and self-awareness from a person's brain. The end product is something that looks human but is in fact a neocon, thus being a favorite weapon of conservatives.
For thousands of years all religions have been using brain washing and Childhood indoctrination as their tool to get so much supports. Look at Islam, how do you think it has so many people to believe that a "prophet" talked to a god. The answer is brain washing. Brain washing takes form as child abuse. At an early stage in childhood the worse religious parents abuse and use violence to force their children to believe in god. Other parents just use the natural gullibility and inexperience of their children to prevent them seein that religion makes no sense. This is extremely common in Muslim families although their methods could be even worse. There are several places children and people could be brain washed. The most common is a church. Other places are faith school where children learn nothing of critical thinking but learn only religous rubbish.