What is the way to get rid of obsessive thoughts and over-exertion in washing the ear during ghusl from janabah, and is the stickiness you feel on the ear considered a barrier preventing water from reaching it?

Avoiding waswasah (whispering of Satan, groundless misgivings) is by ignoring it and not paying attention to it. Washing the ear is by pouring water over it until it is most probable that the water has reached the entire organ. The required comprehensiveness is sufficiently achieved by probable conjecture, and this is confirmed for the ear by tilting the ear and placing a palmful of water on it to ensure it reaches its inner parts. One must not thereafter pay attention to waswasah about the water not reaching or about an obstruction being present. The mentioned stickiness may be an illusion or sweat and does not prevent water from reaching.