Try Carb-Cleaner. It is for cleaning gunk out of carborators, but eats away almost any residue I've ever encountered. It might also shrivel the plastic and allow you to easily scrape it off. It is made by Gunk and can be found at most auto parts stores. If you use it, be careful of painted surfaces. It will take the finish off paint. I dont believe it would wreck stainless steel at all.
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