RAIN-X makes the windshield very very smooth .
I use the original type that I apply to my windshield because it works considerably better than the kind I put in my washer reservoir .
I apply the rain-x with a blue paper/cotton shop towel onto my windshield .
This has doubled the life of my wiper blades because the blades glide over the smooth rain-x finish .
Plus I run my wipers less often because I can see well in a rain storm because the rain runs right off without the wipers at 40 mph or faster .
I also have bought the Costco Goodyear blades and they are very good .