I don't like the smear effect of a full rain-x treatment but I've been using the rain-x wahser spray for years. You can treat window when needed with 6-8 seconds of solid spray or 2-4 runs of the programmed auto wash. It still has the smear effect but only about an inch behind the blade.

Of you don't know what I mean by the smear effect and it doesn't bother you don't look under that rock (ignorance is bliss).

There used to be a treatment for the window that would clean the wipers when they park: they would cut very tiny grooves into the window to clean the edge of the wiper when they came out of park.

The best improvement I've seen on wipers is from my Z28 which when parked lifted the spring tension off the rubber. Greatly improved the condition of the blade and easily tripled the lifespan

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)