If you want to remove the lacquer/finish of the bass, try to get hold of some dog pee. A couple of days ago, a friend of mine (a sax player, by the way) told me he had an old bass stored in the attic. I urged him to get it down so I could have a look at it. After close inspection, he left the bass lying on the floor, and his dog took an interest in it when we left the room. The result: bare wood!