Before pulling them off and going down that hassle, take a short piece of yarn to each wiper,,,, a couple per down the length... then see what happens on the highway. You might be surprised to find out that they are not in the slipstream over the car, but rather in a higher pressure area at the case of the windshield... in the latter case the yarn will be pulled into the engine compartment rather. No use removing them then (although sealing the cowling would help overall with this counter flow).
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