My kid was playing with a pen and she drew a few lines on the TV screen. I tried to remove it with water just after it happened, but it didn't work.
Now the lines have been on the TV for a few days, so how can I clean it?
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My go to for cleaning a screen is 99% isopropanol alcohol and a lint-free microfiber cloth. It works well on many household inks (including most permanent markers). This should remove the ink from the screen.
Depending how hard the pen was pressed and the material of the screen, the pen might have also scratched the screen. Easiest way to see if its ink or a scratch is to run your finger over it and feel for the scratch. Scratches can be removed depending on how much work you are willing to put into it.