I use the triangle pad on plastic arm thingy that Bonnie and the others use. I bought it at Target, but Amazon has it cheaper. I use it with just plain water, glass cleaner seems to leave an ugly film. The Model S seems worse than my other cars for some reason (off gassing? who knows) but I can still get good results with a bit of strong scrubbing. What I do is skip cleaning the inside glass when I'm washing the car. I wait until the next morning, around 10am, park the car facing east, this will reveal just how disgusting your windshield really is. (or wait until just before sunset and face the car west). Now that you can see all the grime -- just clean away.
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