I have used Bestine, which has worked well, and for the slight stickiness that remains a very light coat of cornstarch on the back. Frankly, it is such a pain to deal with I simply don't collect self-adhesives. The few I do are full panes.
This link will get you to a couple of articles on removing self-adhesives from the APS:
https://stamps.org/Tips-and-LinksGeoff