On my '98 E320, during rainy conditions with the AC on, the windshield will develop 2 small fogged areas on the outside near the center and directly above the defroster vents. The defroster is not on and HVAC system is in Auto. Running the windshield wipers clears the fogged area. Has anyone else seen this? How can it be prevented? Thanks.

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Dave

1998 E320
2001 SLK320
2000 Lexus RX300