I just recently purchased a fiberglass rod that is about 25 years old, roughly. It is a 9' two piece. The joint looks to be a metal, maybe brass (it was made in Scotland, brand name of Milbro, and is a little green with some oxidation maybe??). I cannot push the female end (top end) all the way down into the butt end very easily, and I don't want to force the issue for fear of not being able to get them apart again without damage.
My long winded question is: what is the best way to clean that type of a joint, especially inside the female side? I have read Q-tips and alcohol for newer graphite rods. But, new graphite rods don't have an oxidation problem.

Thanks,
Alan