Hellow, how are you today? Go to this tear down and check at 01.28min Put the boombox at vertical, press gentile by anti hour and them the botton stain will easily go free. You do not suppouse to use any clean soap or other chemical producs at all ok. Repet at the other side. Hope Thats help. Grettings from Brazil. https://www.youtube.com/watch?v=Ib7IQfMC...