I will try cleaning and RainX but I have had this car for 18 years and never experienced this problem before. It concerns me that I could get stuck in the rain/snow and have total failure. I checked fuse and cleaned the ends. Tried to remove the combination relay but could not pull it out. Is there a trick to removing the relays? I thought maybe the relay contacts could be burned and not making good contact after operating for a time. I first thought the slow down was related to the rain lighting up and the resistance of the dry windshield, it slows down even with continued rain after 20 minutes of operation.

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Handyjay