I'd really like to know the secret to getting the inside of the windshield clean. On my '04 Town Car, I clean it with Windex and clean paper towels and the moment I drive into the sun, it looks as though I wiped it with a milk-soaked cloth. A friend asked me about this some time back and suggested 'off-gassing' of some sort. Anyone else seem to be defeated here? Is there a secret that the auto detailers know about that they aren't sharing?