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Are the lenses plastic or glass?
If plastic, I'd go with VM&P Naptha (lighter fluid), and quit after that.
If glass, Mineral Spirits, Xylene, Acetone, 1-1-1 Trichloroethane, Lacquer Thinner, Methyl Ethyl Ketone, and other solvents can be employed.
Note that some are not easily obtained, may be suspected carcinogens, and should not be handled by the general public.
You asked.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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