Forget windshield polishing, spraying lots of fluid, voodoo make it perfect factory rituals...

Short of your arms having the wrong tension or the bushings in the motor mounts being bad; it's the wipers...

The OEM wipers are simply awful, no good, very bad. Whoever thought that a thin piece of spring steel with a tiny thin piece of metal would conform perfectly on a 26"+ blade needs to be humiliated in the only way a German engineer can be. Forced to use the horrible thing...

Brand new OEM MB wipers bought in April, produced in March 2020, used for 2-3 months wipers, never once worked right from day 0. The only time they ever wiped clean without vibrating all over the place is if they were lubricated vigorously with ordinary blue washer fluid. They wouldn't even slide on an ultra clean dry windshield properly (which they should!)... clay barred, and news paper clean, no visible sand blasting or pitting and they just didn't work...

Seeing that people had found a love for Trico Neoforms elsewhere; I picked up some Trico Maxx 26" and 22" blades locally and boy do they work.... There's a tiny bit of in and out slack in the arm mount, but it's not noticeable in use and is geometrically tight where it matters.

I'll see how they hold up over the next few months, but they wipe perfectly in the dry and wet, without aid of any kind of lubricant whatsoever other than spritzes of rain.

They work slow, fast, intermittent, and even dry when the rain stops without skipping or streaking. I can't vouch for more pitted or damaged windshields but for one that's 7 years old, and not in too bad of shape, and has been cleaned within an inch of its life 3 months ago, they work better than anything else I've had from the factory.

Are they the sleakest or best I've used? No, but Bosch won't vouch for theirs on the W166 windshield due to the curvature without an OEM like exactfit bladed design they make.

The reason they work? They have a very strong steel cross-section in the blade itself as well as a full contour spoiler. It's obvious they have 3-5x the curvature tension of the OEM's when you install them as well as many times the torsional rigidity.

Summary... late 2019 designed and released Trico Maxx (I assume the Triton's are the same just different retail outlets), 26" and 22" blades 'just work'...

Installation notes : On the square push button ML wiper arms, you need to remove the D adapter that comes with it (two small clips and it leans out to remove from the blade); and replace with the B/C adapter... The Trico installation video's show removing the 'C' portion of the adapter, but leave this in. This is only valid for push button arms with a notch sticking out the end (ours does not have this extra piece of metal). If you remove the C adapter it won't have the correct geometry to fit tightly.

- Things you remember to mention from the day before when you sleep on it....


Spare wipers with shop supervisor inspecting the parts.

End reinforcement profile.

Side profile.

Arm interface reinforcement.

 

@SatireWolf Glad you found a solution, thanks for posting this.

 

I Have found these wipers quiet, ultra long lasting, and silent. They are sold as a pair (exact fit). Don't know why the Bosch MB Branded OEM blades suck, but they do.