I appreciate the input of the question of beeswax solvent and will put that
information to use next season, as in the meantime I broke down and bought
new plastic.  The perfect solution, except for cost!  I'm particularly
intrigued about the 409 and the tri-sodium phosphate, both of which I have on
hand.
 
My problems with glass have mostly revolved around breakage while attempting
to remove panels that have been propolized in the cabinet slots.  The plastic
has been far-less vulnerable, but the eventual visibility problem is of
concern.
 
Thanks again,
Kate
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