art deco vintage french ivory celluloid hand mirrors Byralin & Pyralin frames w/ beveled glass

Lot of two very spotted antique celluloid plastic hand mirrors, both with the original beveled glass.

The glass mirrors look pretty good, but the ivory celluloid is stained and discolored. I have no idea how to clean these, or if it's even possible to restore these to the original color.

One is marked Dubarry Byralin Ivory, one is marked Ivory Pyralin. Both are structurally fine (no cracks, no chipping, mirrors solidly in place).