I just picked up a Wishbass with a purple heartwood body and maple neck. It appears to have a poly urethane finish that seems to have been brushed on, but done very poorly. How can I go about properly removing this finish so that I may refinish the bass? I intend to do an oil and wax finish. Also, the bass has a purpleheart wood fretboard, can I apply tung oil to this as well?