I just gave a Yamaha 201, which has a laquer finish, a bath before returning it to a school. I rinsed it out with warm water, then put in some diluted Palmolive liquid soap, brushed it out, gave it a good rinsing, then dried it off with a microfiber cloth. Now I see that there are swirl looking marks on the bell, like the sheen of oil on water. This is just on the bell, my thought was that it is just oil residue from in the horn so tried to rub it off with a moist microfiber cloth but it is still there. Any help or advise would be greatly appreciated.