How do you change the headlight lens on a 1997 Mercedes Benz E420?

I have yellowish lens that I attempted to clean on the outside but now the inside needs cleaning. Any insight on how to take them off so I can clean the inside of the headlight lens?How do you change the headlight lens on a 1997 Mercedes Benz E420?the lenses aren't removable the only option you have is to replace the whole headlamp assemblyHow do you change the headlight lens on a 1997 Mercedes Benz E420?They're not designed to come apart. Benz only sells the complete lamp assembly. You cannot buy/replace the lens alone.