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I read the comments in here before embarking upon my daughter-in-law's bunch of curtain rods that she wrapped with duct tape when moving, then stored them in a 100 degree + storage facility. The tape adhesive was welded to each rod. The only highly effective remedy was WD-40 and cheese cloth. I sprayed the cheese cloth with WD-40 and simply rubbed till every molecule of glue was gone. 1-10 on effort, about a 4. Easy. Posting this to help others!