Efficient method of removing double sided tape from back from spoiler?
 

I have a trunk lip spoiler that I am trying to reinstall that was held to the car with strong double sided tape. I need to clean off the old tape prior to the re-installation. I used goo gone (the less nasty orange oil based stuff) for part of it but it didn't help as much as I had hoped.

Suggestions for other techniques or products? WD40? while I'm dealing with the underside of the spoiler I want to be careful about the paint.

Goo Gone (let it soak) and a plastic razor blade helped me.
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