That musty smell is often tobacco and sometimes mildew and other stuff that grows in damp places. Items from a smoker's home sometimes have, not only smell, but also a layer of gook which is disgusting.
Airing in dry air and time will help. Ozone, Chlorine, UV, all help.
Chorine bleach will get rid of anything and everything but, of course, it cannot always be used depending on the object to be cleaned.