I've come across a circa 1965 wood door with four large glass inserts.
This is an exterior entry door to a garage and the glass has what
appears to be a white-ish scale on the lower exterior sides.

I've tried just about everything I could think of to remove this scale
without success including white vinegar solution.

Can anyone please make some recommendations, short of replacing the
glass, in an attempt to remove this unsightly scale?

TIA