The fan is run by a small motor built into the fan body...same as all the other tiny computer fans that electronic stuff has these days.

I had some Isopropyl alcohol here at the office, and I rubbed it on my office window with a paper towel and wetted the glass really well - it dried clear without any trace.....however I don't know for sure that it is a good solvent for the haze and capable of removing it without rubbing a cloth on the light or reflector.  I want a cleaning product that can remove the smoky haze from the lens without rubbing....as I am sure there is also haze on the reflector - and I don't want to rub anything on the reflector that could scratch it.

Lens cleaning solution for glasses or camera's is a good thought.......provided it rinses clean.  I put a drop of eye glass cleaner on my glasses and let it dry - it left behind a faint white mark when it evaporated.

My concern about the Everclear is that there might be some sugar in the mix - and that most likely would leave something behind when the alcohol evaporates.  I maybe could rinse with distilled water or Isopopyl alcohol....and if rinsing is used I could maybe use a much stronger cleaning product and then rinse several times.  The drying can be done with my compressor and air nozzle...then set in the sun to bake out anything left in the joints/crevices.

Verslagen:  My concern about using acetone is what it could do to the gasket between the lens and reflector.   

No sugar in Everclear.
Holding the reflector like a bowl and swishing?

http://www.maxwettsteinfitness.com/Library/Alcohol.htm

Glasses don't get near the TLC as cameras. You might call a high end camera shop and get advice. They know how to deal with First Surface mirrors.
A copier repair shop has to clean the optics inside those things. And they are F.S. mirrors, too. But you're playing with a deposited reflective film on plastic and the other mirrors are silver on glass. What Exactly IS the reflective surface made of is the question.

Getting rid of the residoodoo left on the heat sink and Not eliminating the fans necessary lubrication and wondering IF that necessary lubrication will cause the problem again,,, hmm. I'm gonna say it wouldn't. If you're able to clean it up without wrecking the fan..
Ahh, simple swap and Whammo, unintended consequences borne out of an unknown unknown.

I have the same fogging with this bulb in my setup.  I have a HELLA  7" with a lead crystal lens.  Inside of the lens is completely fogged.

Dave, is the coating on the heat sink out-gassing resulting in fogging on the lens or is the heat itself causing discoloration?

What about something like this?  http://www.kleanstrip.com/product/toluene.

Guy I bought my house from refinished tubs and left all sorts of stuff in my shop, including some of this and other things but I haven't used them on anything to know what they will and will not "eat" or melt.  The website above has links to all of their products with good detail so maybe something in there can offer a possible solution (no pun intended  )

Don't forget about B12 Chemtool.
Berrymans doesn't leave enough behind to mess much up.

I want a landing light .