If I'm not mistaken, Easy Off oven cleaner contains sodium hydroxide, or lye. And lye is a strong alkaline chemical that is damaging to wood. I'm even cautious when using household ammonia to clean gunk and oil from stocks. It needs to be neutralized and thoroughly rinsed. For that reason, I've avoided using Easy Off on gunstocks.
Several years ago, I lucked into a close-out sale on good old Methylene Chloride paint stripper, and laid in a good supply. It does a good job of removing polyurethane and just about any finish but a baked on powder coat on metal.