My new WRX has a new best friend. It is RAIN X. Rain X can be put on any window surface and it will send the water beading off. I had never heard of this product until a few days ago. I put it on yesterday and drove in the rain today. I almost didn't even have to use the wipers at all.
If you have never used it you put it on like wax. Then polish it off.
This product sure helped in the rain. I think you can buy it at any auto parts store.
Better Vision = Better Driving