Windex with finest grade steel wool you can find (example #0000). Steel
wool will take off old cigarette smoke, glue residue from window stickers,
and other nasty stuff. Get the window nice and wet with the cleaner and
then use the steel wool. You don't need to scrub it hard, just gently move
it around the window. If it's really nasty you will need to clean it again
with just window cleaner and a rag. Do not use it on the rear defroster
window though or you will ruin it.
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