Concerning that citrus stuff- I'm almost positive it would have a moisture content. (I studied organic chemistry for 5 years.) Water is considered the universal solvent for a reason. I would still try the ronsonol or Zippo fluid first then that orange stuff. Good luck!
I understand your concern, Jay. Its suppose to be 100% orange peel oil. Also the APS had a video on their website, and they were supporting it. So for it has worked. and then again its just those damn self adhesive stamps, not like some old classics. would never do that to great stamps like those. lol
hope I'm not too late. See my post here http://www.stampexchange.com/threads/how-do-you-remove-unused-stamps-from-a-album.77/ for unsticking unused stamps. Richard