Welcome, Worldview,
I agree with PD, these beads aren't pearls. Possibly they are glass, or a type of coral (unlikely). They could use a bath, for sure! Use a mild soap like you would for babies and rinse well. If they have sentimental value, restringing will give them a fresh look. Are there any markings on the clasp, from the photos appears to be base metal? Vintage beads like these can be used creatively in new pieces, although no big $$ value.