Marchal restoration?.....help!!

Hey I've been collecting Marchal 750 parts since December for my 86.....and I've got about 5 reflectors...four lenses....two good covers (thank GOD! ) My car had them from the factory but the owner left the covers off and both lenses were broken when I bought it (covers were in a box next to the factory cargo cover!!! SCORE in her garage) but my question is this....I've got one PERFECT reflector and the others are pitted/loosing their chrome. I know that there is a way to restore these because I did reflectors on an old set of Perlux 500's....but I don't remember how....does anyone here know how? Thanks in advance!!

The lenses are fine.....it's the reflector that needs help