If you haven't already, get you some
PIAA Silicone Wipers. You'll never need rain-x again, and you can drive in heavy downpours on the highway with your wipers OFF! (as long as you have enough speed, and there isn't a huge semi truck in front of you throwing up fine mist from the water that it is obliterating in its wake!) Even then, the lowest wiper setting is more than enough. While other folks are pulling over on the shoulder, because their highest setting won't give them visibility, you will be driving through with clear vision. I just replaced mine about 3 months ago, and the set I had before these were on my car since 2002! Best investment EVER!!
P.S.
The ones I bought have the spoilers on them that keep them planted to the glass for even better wipes!