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i'd be tempted to very carefully 'test clean' an easy to examine area with acetone.
I'd take a razor blade and try scraping a small area to see if that helps. Make sure it's a new safety razor that can't scratch the glass.
 
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2015 Outback 2.5i Limited, Ice Silver/Black
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Adhesive from transport film?
 

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2019, Subaru Outback Limited 3.6R
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2005 Mazda 6 && 2007 Outback 3.0 LLBean, WGO
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I'd take a razor blade and try scraping a small area to see if that helps. Make sure it's a new safety razor that can't scratch the glass.
I was gonna suggest a razor, too. Disagree about a safety razor, though maybe I just misunderstand you.
I've used just a plain single-edge utility blade before myself:
489921

Just run it as flat as possible along the glass, with soap & water. DON'T PRESS DOWN! (not any more than you need to keep it in contact) -- just make a pass, clean the blade, make another pass, etc. Takes off all sorts of dirt really easy, but on very curved glass it's much riskier, easier to scratch it b/c not sitting flush (like the rear window... ask me how I know 🤦‍♂️)
 

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Also, for those who are seeing this on your own car, have you tried cleaning the inside, too? I can't tell if all the attention so far was just the outside.
 
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2020 Outback XT Onyx
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+1 on microfiber lint.

I use SprayAway ammoniated glass cleaner very sparingly to clean then buff with newspaper.


I clean at an angle into the sun with poliorized sunglasses.
 

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I was gonna suggest a razor, too. Disagree about a safety razor, though maybe I just misunderstand you.
I've used just a plain single-edge utility blade before myself:
View attachment 489921
Just run it as flat as possible along the glass, with soap & water. DON'T PRESS DOWN! (not any more than you need to keep it in contact) -- just make a pass, clean the blade, make another pass, etc. Takes off all sorts of dirt really easy, but on very curved glass it's much riskier, easier to scratch it b/c not sitting flush (like the rear window... ask me how I know 🤦‍♂️)
No, I meant a single edge as you show. :)
 
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i only see the sparkle after YEARS of driving....it is caused by the constant barrage of sand, etc against the windshield
 
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