A few months ago, I was foolish enough to leave one of those 6 qt boxes of Mobil 1 5w30 in my back seat. Needless to say, one qaurt leaked and now I have a mess that just keeps coming back. I've tried everything - Lexol, isopropyl alcohol, dawn - it all takes the oil out temporarily but then it rises to the surface again the next week! Not to mention, I now have all of these ugly ripples in my leather. Does anyone know what to do - is there any hope at all?