I'd first try TSP, that is what you clean a wall with before you paint it anyway, so, You'd be killing two birds with one stone. Also, if you don't want to do that, you might first try white vinegar mixed with water. which you probably already have on hand, you need about 1 part White Vinegar to 3 or 4 parts Water. If this doesn't work, go to your local Home/Hardware store & they'll have something just for this (but, I'd bet they'll tell you to use TSP too!)
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