What is the safest way to clean the inside of my car windows?

Page 81 of The Trouble With Tulip indicates that the biggest mistake people make when cleaning the inside of their car windows is to use store-bought glass cleaners because they're ammonia based. The ammonia can dry out the plastic, rubber and vinyl around the glass. A better cleaner is eight parts vinegar to one part water. It works just as well but doesn't hurt the lining.