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If the stuff has chemically bound to the surface coatings it may be a case of removing the old coatings and have them re-applied or swopping the lens which ever is cheapest or available. Looking at the solvents you have applied they have probably been compromised in any case. It would be interesting to know what the stuff is so the rest of us can avoid the same fate. Can you remember what you did the last time the scope was used? Or do you think it happened when the scope was in storage?
Ciao Mark
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