notbob posted for all of us...
On 2017-02-01, ChairMan wrote:
I'll second the Rain X, I've used the Latitudes for a couple
of years and will keep using them
Amazing how many different stories pop up. But, I feel I should weigh
in with my poor opinion of Rain-X.
I've had nothing trouble from my Rain-X stuff and would not recommend
Rain-X products in any form! I bought Rain-X blade refills and used
the gallons of Rain-X windshield washer fluid my late mom usta buy.
What I ended up with, in her low-mileage '91 Toyota mini-motorhome, is
blade chatter, most severe. The blades almost chatter completely off
the windshield on the rebound stroke, thereby rendering the wipers
almost useless during a heavy rainfall.
I've never experienced this phenomena, before. Ever! And I'm almost
70 yrs old and have owned/driven many car types/brands, over the
years.
Since I dumped all the Rain-X windshield washer fluid and will prolly
lose the blades, this Spring, I'm hoping the issue will be in the
past. Just using a different windshield washer liquid (no matter how
cheap) has reduced wiper "chatter", dramatically. I'm confindent
losing the Rain-X blades will eliminate the problem, completely.
I have no proof this is strictly a Rain-X problem, but none of this
was EVER an issue before I got those damn Rain-X blade refills.
I agree with everything here. Must use soft scrub to remove it.
BTW, sometimes cheaper 3rd party wiper replacements (not jes blade
refills, the entire blade assy) are no bargain. I once bought some
cheapo replacement wipers ('87 Honda Civic Hatchback S model), and
they allowed zero air-flow through the plastic wiper arm sections.
The entire wiper blade assy would lift completely off the windshield
at any speed above 65mph. I finally hadda buy some factory Honda
wiper assys, at 4 times the price of the cheapo's, to get wipers that
actually worked, properly. 
See my other post. The Bosch IIRC have the vents.
Another thing to think about is that the arms can get bent using drive
through car washes and sloppy handling.
The best test is to pour a bucket of water over the windshield and if it
sheets the the glass is squeaky clean and to move on to further diagnosis of
the problem.
nb
--
Tekkie