Posted for mike reinath <n3602m@yahoo.com>:

 <<Can any of you point me to instructions/ tutorials
 that might guide my efforts in removing fish-eyes or
 otherwise restoring clarity to Plexiglas?>>
 
 Greg,
 
 The surface of the Plexiglas can be vapor polished
 with methelyene chloride. This is a procedure that
 takes some practice. You have to sand out the
 scratches with progressively finer paper until you get
 to 2000 grit. You have to make sure that you get all
 the scratches sanded out each time you go to a finer
 grit. Once the surface is wet sanded to 2000 grit, you
 are ready for the vapor polishing. The methelyene
 chloride is brought to a slow boil in a water bath.
 You use a flexible hose to direct the vapor onto the
 surface. The hose end is held about an inch or two
 from the surface. With the methelyene chloride at a
 slow boil and using a 1/2-inch hose, it only takes a
 couple of seconds for the surface to polish out. You
 have to keep the hose moving.
 
 I have not done this on a canopy, but I have done it
 to Plexiglas windows we use in the wind tunnels at
 work. If you try it, practice first, and don't breathe
 the vapor.
 
 Mike Reinath
 LNC2 360 at 720 hrs TT
 San Jose, CA