How do I remove crushed glass encrusted on my decorative wall lamp diffuser?

The crushed glass I am referring to are very tiny almost similar to glass beads used in women’s dresses; they’re caramel colored. The diffuser is leaf shaped and frosted and the caramel crusted glass encrusted on it are at the tip of the diffuser. I tried soaking it 24 hrs in soapy water, bruhed it with steel brush. What I haven’t tried though is pouring on it lacquer thinner.