The car wash uses "clean" cloth towel to wipe the windows...but they
all have a lot of soap residue and aren't rinsed sufficiently.
I decided to use white bounty paper towels and Windex.
It really doesn't do the job. When the sun is at a certain angle in
the sky, the windows look embarrassingly dirty...no matter how many
times you go over them.
Somebody suggested a mixture of vinegar and water.
I remember my dad washing the house windows with ammonia and water.
The problem is the scent would drive one crazy.