Alan,
Did the kit from Eastman help much on your windshield? Between the sand blasting and wiper wear when driving into the sun I can barely see.
They've been wet before and will get wet again. I've had people ask me if I drive my cars in the rain. I guess they think I can predict the weather and never go out unless I know the sun is going to shine for a few days. Yep, I've driven in the rain and use electric wipers with Rain-X. If you drive your old car it's bound to get wet at one time or another.
Unless forced to, why drive in the rain? If the weather is bad, I leave'em home...