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Depending on the amount of dried grease there is, you may want to try a bleach cleaner or a strong alcohol based cleaner (usually for getting off graffiti or heavy grease.) If you have already tried everything on the market to get it off, try just using a good primer (like KILLZ...check out the blog below!), KILLZ can cover up anything and make it so you don't have any of that grease bleeding through. You may try two coats of killz if it's that bad. But in the future, just make sure any grease that get on the walls to wash it off immediately or at least weekly to keep your paint job looking new.