I have never tried Mars' idea, but I find that an assortment of scraper tools works in the end. That, and a LOT of elbow grease. I've ripped my fair share of that shit out of my fair share of Foxes by now. Its a sonuvabitch. Anything that is powerful enough to fuck them up chemically will probably wreck your paint enamel and stuff underneath.
You know, carpet will cover them up, though. You midas well put a 5 lb slab of carpet in there.
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