Just put them to soak in Woolite and cool water. Rinse and roll in a WHITE towel and wring. Place them flat on another wHITE towel to dry.
If that doesn't help remove the discoloration. I have found the Efferdent tablets help remove a lot of the old "storage" stains.
I say white towel because I washed doll dress that was on my antique doll in warm soapy water then rolled it in a very old blue towe. That towel had been washed at least a hundred times. The organza dress had blue spots on it!! The efferdent took them away.