I'm reading this with interest because I can't see through my MES's window at all, and the light's glass cover is also blacked out!
I was gonna hit 'em with oven cleaner.
I'll try the razor blade thingamajig, but I'm really not afraid of using the appropriate "chemicals". If you analyzed what was in the wood smoke we all love, it'd make you cringe!!!! Talk about a laundry list of known carcinogens.
I wonder how well some good old Everclear might work. Just avoid sparks or flame! And if you happen to absorb some, well.