I bought a bass a few weeks ago that the previous owner had gotten signed in magic marker by a couple famous bassists. The bass is finished with a single coat of minmax tung oil and then wax. The marker is on top of the finish but with such a thin finish I'm sure it's penetrated somewhat into the wood... I started off with alcohol and then tried naptha and finally alcohol and white 3m pads. I've gotten 75% of it but do I just need to brute force sand through it at this point?