Cleaning Plastic Rear Window?s

["Henrich, Dave" <dhenrich@mseng2.waterloo.NCR.COM>]

Being new to the group, this may have been asked before.

Is there any way of cleaning the "frosted" plastic rear windows? I seem
to remember seeing in a boating magazine that a cleaner does exist at least 
in the nautical world.

Any help appreciated,
Dave
(1979 MGB , Pageant Blue(original), 80k)