94 Camry - How to clean / Replace Headlamp

Hi,

My 1994 Camry LE (4 cyl) Headlamp is so blurry and dull due to lot of dirt accumulated inside. I am thinking to clean the headlamp cover..

1.How to remove the headlamp cover.. if it is a single piece.. How to remove whole headlamp.

1. Any liquids or gels I should use for cleaning or mopping with soap water ??

Regards, Rama