More Darley work..

Since everyone else was working on their Darleys, I decided to take mine apart.
..Not really, but since the girl thought the Darley was the neatest light, I was forced to start working on it.
It's off getting stripped/soaked, and while I was in "hurry up and wait" mode, I thought I'd ask some questions about the reflectors..
These buggers:


They look and feel like the cheapest possible way to make a reflector. How are they best cleaned without making them duller? How common are these? (As you can see, I have at least one with a fancy bullet-hole in it!)
--Mike.
..Not really, but since the girl thought the Darley was the neatest light, I was forced to start working on it.
It's off getting stripped/soaked, and while I was in "hurry up and wait" mode, I thought I'd ask some questions about the reflectors..
These buggers:


They look and feel like the cheapest possible way to make a reflector. How are they best cleaned without making them duller? How common are these? (As you can see, I have at least one with a fancy bullet-hole in it!)
--Mike.