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because you have left it so long the coatings will be wrecked -and basically not repairable [costs too much]
if you are lucky then the lens may be ok...but id hazard a guess youll be selling it for the cost of the tube/focuser.
id sell your other items separately - youll prob get more that way
hit the inside [ie no edges] of the lens with acetone - make sure whatever cloth you use is nice & moist--dry will scr further. also keep the acetone away from the edges [you dont want it getting to the lens rings] ; make sure to rinse it off with distilled water
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