I've wiped down my wiper blades with WD40, 303 or ArmourAll(or similar products) with, Mmmm, decent success. However, after the wipe down, I let the product dry and wipe again with water to eliminate that "over residue"(if you will). This helps to reduce the smearing/fogging/hazing(or whatever your experience is) on the windshield glass itself.
Years ago, it was a bad thing to WAX your windshield as, when the wipers went over the glass(during the rain), the windshield would FOG or HAZE(momentarily). I mean, if it were daytime, you could still see however, if the wipers were full ON, the FOG would remain. And if the wipers were on INTERMITTENT, the FOG would dissipate slowly until the next INT wipe. If the INT was set to the fastest wipe, the FOG wouldn't have enough time to dissipate. And this was toooooo dangerous for my liking and even worst at night in the rain with oncoming lights of other vehicles or the overhead hiwy lighting...OMG!
This is the reason that I don't like putting any type of paint polish/wax/silicone/quick detail on my windshield, although I have read of others doing this with good/great success. I've talked to other who have used NU-FINISH of their windshield or certain quick detail products(TWIS&S) and love it. I do like Rain-X on the glass with a WD40 on the wipers - however, together(WD40 & Rain-X) this can sometime cause the wiper to hop as both the windshield & wiper blades are super clean.
I guess that the whole point is, you gotta do what works for you!
My main concern is...night time driving in foul weather.