This was a real surprise. My '88 GL has gotten really dirty with pecan tree
drippings and other nasty city dirt and soot, and I was considering how
much effort it was going to be to clean all that off and spruce it up a
bit, and clean the rubber on the windows. My son came out, looked at it,
and said, "Here, try this!" He handed me a can of Lysol spray on foam bath
cleaner and told me spray it on and then wait until the foaming stops. I
sprayed a small section in an inconspicuous place and after the foaming
stopped, wiped it of with a dry rag. Did I ever get a surprise. The
dirt,soot, and street crud just wiped off. No rubbing with a brush, no
flooding with water, nothing. Spray on, wipe off. Paint looked as good as
new for the most part. Window rubber the same way. It's so easy. Try it.
Use it on the inside on the dash as well. I haven't done it yet, it rained
today, but I would recommend hosing off the outside after doing this and
then app,ying a coat of wax, for the dash and other interior area suggest
aterward wiping with a damp/wet cloth.

Also apply the method to glass as well.

I use a plumber's silicone grease from Home Depot on the rubber afterwards.
Rub it in.

John