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Someone gave me a 3-9x50mm yesterday and it looks like the inside of the objective lens needs to be cleaned. The lens will unscrew out of the bell housing, but it is a nitrogen filled tube. (TBH it looks like someone already tried to clean the inside of it...) the image isn't very clear at 9x, and when I focus the eyepiece to clear the image, the reticles becomes so blurry i can't see them. any suggestions on what to do with it or how to clean it?