Griffo,
I had a chat to the guy at Vintage bulbs (who also sell reflectors), and he gave me some good info on new versus old lights which made sense.
The old dull reflectors are affected by age and water ingress, this has a tendency to penetrate the reflector surface and eventually dull it and maybe lift it off.
personally I would scout about for a new set (unless you after a concourse restoration).
new lights look so nice, even when they are not on
the same shine and colour etc etc.
all the same... hit em up with the CLR first and see what happens!
Cheers
Ed