Auto Light Bulbs What Is A Good Way To Remove Corrosion From Auto Blinker Light Fixture?

What is a good way to remove corrosion from auto blinker light fixture? - auto light bulbs

1 page flash faster than the others, replacement bulbs, the light is not flashing, but on the front. I picked up the ball and sand the cork tryed a little. But it is even worse. Well, what are ust time.before occasionally.