I am in the process of repairing a badly separated Rodenstock Sironar and I have the doublets apart but cannot get the remaing cement to clean off of the optics . I have tried reheating in Oil to 450 degrees (that's how I got them apart to start with), soaking in various paint thinners containing methylene chloride, ac etone etc.. Nothing has made a dent in the remaing cement.
Ideas?
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