I recently purchased a a sailboat (and am new to this forum) that is in excellent condition but I have one to-do item that has been bothering the heck out of me. There appears to be blue ink marks left in the cockpit by someone who must have had a ballpoint pen in their back pocket while sitting. The fact that the boat is in such great condition everywhere else only makes these marks stand out all the more. Any suggestions on removing this? It is on smooth surface, not non skid. Thanks.