It was easy to remove the front headlight assy but I need your help to open the unit so that I can clean the dirt, frosting etc from the inside plastic. It is bad enough to reduce the strength of the light beam.
Understood, no one even uses "sealed beams" anymore, what I mean is your entire headlight assembly (the entire thing) is a sealed unit that is made to keep water out. People usually open them up to remove the amber reflector, or spray the chrome pieces black, or in your case remove fogging from the clear plastic.
This usually involves heating up the headlight assembly in an oven to loosen the glue, and then prying it apart. The tough part is putting it all back together and making sure your new seal is watertight.