Sorry, I know this isn't ES-specific, or specific to any car, actually. But I'm looking for suggestions on how to clear up this wiper streak. This is a brand new wiper - the THIRD, in fact, so it's definitely not a wiper issue. And it's only on the driver side. Cleans on the upstroke, streaks on the downstroke. Maybe some kind of residue on the glass? Should I try rubbing alcohol or something?

 

Have you checked to see if the wiper arm isn’t bent (as can accidentally happen sometimes when chasing inserts) or is mounted securely?

 

Hadn't thought of that. Thanks

 

Could be a combination of things. First thing's first, you have to start with a clean windshield. And no wiping it or even washing it doesn't make it clean. You need to strip the windshield down, master-detailer style. And no that doesn't mean "clay burrrr" like most DIYers might suggest.

Yes you should use a clay bar in the process, but the windshield pores needs to be chemically and mechanically stripped. If you use wipers a lot, the rubber residue will stick to the glass forming a film or a layer. And that would just be *one* source of likely contaminants. Windshields are full of them.

Not sure what array of tools you have on hand, but a decon process would involve wash and clay then rinse -- water spot & iron remover -- polish by hand or machine (preferably by machine). Then sealant.

There are kits you can buy on the market that have stuff for you to do much of this, so check that out too.

You start there.

Then you start investigating wiper blades, arms, wiper blade brand, etc.

 

about once a year, maybe twice a year, i strip & decon and re-seal my windshield. makes a world of difference.

 

Looks like an oily film might be on the windshield. Try cleaning the windshield and also the wiper blades with soap and water. If you use car washes it could be the wax they spray on. Still soap and water is all you need.

 

Bent arm most likely.
Are you using OEM wipers?

 

Solid advice.

I live in the PNW and wiper performance is important. I clay and/or DA machine polish the glass about once a year. Wipe down/wash the blades periodically to clear residue. You’ll be golden.

In your pic, my chemical eye sees a smear of hydrophobic material in the streak - that’s why it beads and bunches so much and so differently. Clean it and you’ll be fine. Really.

 

In case anyone else encounters this: Problem solved. A good addition to my car car arsenal

 

I use the Griot's glass polish, too. It works great. I have the advantage of living about 30 miles from their store and HQ. I run by there about once every 3-4 months and stock up on what I need. Highly recommended!