Me too. BTW, the primary (maybe only) ingredient is orange oil. It's a reasonably good general solvent but CAN damage a few types of plastic and latex paint if left too long in contact. It's gotten fairly pricey, especially considering it's basically a byproduct of the OJ industry!
I have successfully used creamy peanut butter to remove sticker residue from glass, bumpers, etc. The peanut oil seems to act as a solvent for the residue. Crunchy peanut butter tends to scratch the paint, though.
The paper "Sticker" sounds like the adhesive used for "Bumper Stickers" and it is very tenatious. I have for many years used "WD-30" to remove them. if porus paper just soak them with spray if rhey are plastic peal the surface of the sticker off and spray the adhesieve and residue. next day wipe the mess off with a paper towel. This Works!
I had the same problem in college, cheap paper backed parking stickers. My trick was to take the sticker and remove all but about a 1/4" of the wax paper backing from the top and bottom (more than enough for good adhesion) then I took some clear plastic wrap from the kitchen drawer and applied it to the exposed adhesive and trimmed off the excess. That left me with just a couple small strips of adhesive to stick it to the windshield and make removal much easier. You could leave 1/8" on each end and still have plenty of holding power. The clear plastic wrap was easy to see through and the parking nazis never bothered me.
JaForster, that would make too much sense for a government beuracrat to understand. More than likely the sticker printer contract was up for renewal and some crony in the government chose one of his lobby buddies or campaign contributors for the new contract. This had nothing to do with materials, convienence, or efficiency. Those running the government do not concern themselves with the peons disgust of scrapping crappy stickers!
And just to make my point, do you remember when the oil lube places used to stick stickers on the door jam or under the hood? People complained and the business had to adapt. The nifty polymer sticker you point out was used and now they all use them. The businesses listened to their customers!
I use something called "Goo Gone". I don't know what's in it, but it t works well and I have yet to see it damage plastic. It even says on the bottle that it can be used to remove stickers. It does leave an oily film behind, which you will have to wipe off after removing the sticker. I usually use it to remove the labels from plastic and glass bottles and jars for recycling.
Reading the trials of sticker removal makes me ask the question - what is the purpose of the adhesive? Is it to keep the tag in a specific location, i.e. stop it from moving around?
Is it to stop potential theft? i.e. make it difficult to remove so it is damaged during the removal process?
Seems that you have told us that the sticker is unique to the car and has details of the car registration and that the parking enforcement officers can check this detail.
If the purpose is only to identify a car which has a legal right to "park" then the answer seems simple - print the sticker on the thin polymer sheet - just like the reminders used by the rapid oil change companies. The surface of the polymer is smooth and will "stick" to the glass. This decal can have a simple bar code printed on it as well as all the other details so the attendant can read the details or scan with a mobile device to ensure it is valid and the right car etc etc.
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