Updated: 2023/11/15 Shows how to stop wiper noise and skipping problems permanently by adjusting the wiper arm angle with a crescent wrench. Different people may describe this problem in different ways, like jitter, judder, jumping, skipping, stutter, shutter, hop, bounce, wobble, chatter, vibrating, squeal, or squeak. A lot of the suggestions people give to stop wipers from making noise will only last a short time because the wiper is still being pushed instead of pulled. Once the cleaning or treatment starts to wear off, the noise will come back. First, try cleaning you windshield, replace the wipers, and use a window treatment like rainx. If your problem comes back in a week or two, you probably need to adjust the wiper arm angle.

The tape measure isn't really necessary, it just make it easier to see the angle change. You can also use a magnetic digital angle finder.

Things you should check before adjusting.
Wiper and windshield contamination
Try a window treatment like Rainx
Bent blades (the metal part that holds the rubber wiper strip)
Old blades (try replacing them before you bend the arm)
Different brands/designs may skip on certain cars, so try others

The classic symptom is a vibration or squeal going one direction only. If you have lots of noise going both directions, the problem is most likely something other than blade arm angle. Blades distort with time. It's best to wait a week or so after installing new blades to let them settle in before making a blade arm adjustment. Also, blades tend to become deformed over time due to the pressure of the spring build into the arm pressing on the blade 24 hours a day. Some skipping may be noticed (usually on the up-stoke) until you run the wipers for a few minutes. Eventually, the deformation may be too bad to return to smooth operation without a mild adjustment or replacing the wipers.

Smooth operation may be plus or minus 10 degrees (or maybe more) from a right angle. Only adjust the arm enough to get smooth operation. If you go too far, the blade may skip as it becomes permanently deformed with age, or you may have skipping when you install a new blade. If your blades are approaching a year old, it's probably best to replace them instead of adjusting the arm.

If you have trouble telling which wiper is the problem, most cars have the ability to lift one of the arms up beyond the detent (with the hood closed). Then you can run one wiper at a time. Just make sure the arm won't strike the hood or something else while it's in the lifted position. Also, run the wipers in their slowest mode with the engine off (if possible). Sprinkle a tad of water on the windshield and look for the skip marks just after the wiper passes. You can turn the key off (on most cars) to stop the wiper in mid stroke if necessary.

If you wonder how your wiper arm was bent from it's original angle, here are some things that may have caused it:
Striking ice or snow piles on the window.
Oil change businesses allowing the arm to slam down on the window.
Carwash striking the arm.
Leaning on the arm while cleaning the center of the window.
Heat and time may cause the metal in a poor design to fatigue.

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These are just tags after this point to help people find this video:
squeaking, chattering, skipping, smearing.
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Stores like walmart autozone costco sell wipers.
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