Originally Posted by redlude97

While contamination could be the source of the issue, continuing to clean the rotor if there isn't contamination is the wrong approach. Break in actually involves transferring pad material evenly to the rotor. If this doesn't happen then the rotor will drag at different rates around the rotor that usually causes the squealing. For me the easiest way to do this is to take it down a descent without coming to a stop with multiple hard braking efforts. If you keep cleaning then you are starting over each time and have to follow the break in again