What is the best way to clean the A/C evaporator in the rear overhead?
The one I have is completely covered in a thick layer of dust and dirt
with no chance any air flows through it. I really don't like the notion
of having to drop the unit. Has anyone else had a problem with dirt
build up there, any way to filter it? Any advice sure would help!

Then there are the vents that are on the rear portion of the back side
windows, they where also packed with dirt. I did manage to vacuum most
of that out. How would to go about replacing the filter in them?

Lastly, I still can't figure out that sliding glass latch, how does it
come apart?

Thanks