Cleaning inside of headlamp housing

my family owns a 2009 Maruti Suzuki Alto. Sometime back the RHS lamp exploded inside the housing, since then the housing became hazy, although the light output does not seems to be affected much, I want to know of it is possible clean the inside just so that both headlamps matches. I have tried vacuuming after removing the housing from the body and all the big glass bits were removed, but a small layer of glass dust still remains. If you can tell me how to remove this it would be very helpful.
PS already thought of stuffing a microfibre cloth inside, but did not wanted to risk it as it may cause scratches in the reflector. The below posted image is for reference only