Except some brain cells. Be careful with MEK. I will tell you a quick little story.After the eraser I think that what is left is IN the leather. I read a Paul Long post that mentioned barge thinner. Another post mentioned MEK. I have some MEK and at this point nothing to lose.
MEK will break down the fiber in your leather. It will also dry it out SIGNIFICANTLY....use it as a last resort. You'll need to really oil it down if you use it. It will also essentially turn your leather white if you use too much.LOL, yeah, MEK and I are old friends, you speak the truth about it, nasty stuff but good at what it does!