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Ring on window

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I Was wondering if anyone have experienced or knows why this is happening.

I have a approx 2 month old MY and just recently noticed a ring on the rear window. It shows when the window is cleaned as it “dries”/whick water faster. If you look closely you can see it on the window when dry and if the light hits right. Haven’t noticed it before but it seems like it can be cleaned off with window cleaner etc.

Anyone know why it might be there and how to get rid of it?
 

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hey just like the tape imprint that will be on there this ring will be on places of the window. you can use a cleaning solution for windows and also for a finishing use a clay bar to completely remove any grime left from the tape/suction cups
 
On the outside. Tried to use two different window cleaners without luck.

Can be felt very discreetly when you run a nail over it.

Looks like the imprints where the suction cups from the assembly robot placed the glass in position. Mine had the same on the top. Good cleaning with alcohol and they will disappear.
Manual says not to use a pure cleaner etc. is it safe to use a rubbing alcohol or something like that?