I did not like those stickers on the side windows and removed them.
To get them off put the side panel on top of the print bed and allow to heat up to 60C. That lets the glue start melting.
Then scrap of the sticker slowly with a plastic scraper ( I used one of my calibration cubes, works fine ).
The remaining glue on top of the panel was wiped off using brake cleaner fluid and some paper towels.
To completely get it transparant also remove the thin foil thats attached to the inside of the panel.
Like it so much better. Worked for me, do at your own risk.
PS: if you used the heated bed for this procedure don´t forget to relevel 