I have spotted this from Don Schilling at http://stampcollectingroundup.blogspot.com/:
"Air-Freshener Removes Unsoak[a]ble Stamps
Guest Columnist Peter Butler writes in It’s Like Magic: Removing Self-Adhesive Stamps from Paper, an article that appeared in the October issue of American Philatelist, that one of the products that seem to work well removing those pesky, unsoakable, self -adhesive stamps is an air-freshener called Pure Citrus."
The original article is here:
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An example of self-adhesive stamps (I show you also the back of this beautiful, luxuriant pane of stamps): Hawaiian Rain Forest.
Now, in hi-res (high-resolution) for you to properly appreciate the exquisite artwork:
Click on it, then click again, to zoom in.
:)