this is a age old pain in the aspirin. Everyone or most everyone here has dealt with it. I spent the last 2 mornings elbow greaseing two chrome hoops getting off glue residue. I did have good luck with the Citristrip on a 16" floor shell. You have to scrap it after it sits, in my case over night. and I know that fine sheen that is still there on shells after you think you have it all off.
I would not recomend sanding. It just spreads it all over the shell. I have found that WD40 works as a last step to removeing that sheen. I have used, paint thinner, goof off, goo gone, citristrip, acetone, and as mentioned earlier xylene, xylene cuts it pretty good. Still it is a pain and I hope someone finds something that is a good wipe off. Still hopeing.