Here's a tip I got from my mechanic. He is the main mechanic at the local VW
dealership and a real genius who tries to save me money. He did this on his
own vanagon.

He told me to take the headlights off and take out the bulb. Then take a
coat hanger and wrap a clean piece of cloth around the end and crimp it.
Bend the Q-tip end about 2 inches from the cloth Q-tip you made and work it
inside the headlight to clean the lens. You might make a handle at the other
end of the Q-tip to make it easy to manipulate.

I was surprised to find that a thin film of almost invisible stuff came of
very easily.  Just look at what you are doing and try to be thorough. Then
put the headlights back in the van.

I also bought those extra vision Sylvania lights on sale now. Both should
make quite a difference.

My mechanic says it makes a big difference in visibility and costs nothing
to do.

William