I’m a big advocate of the Light Phone and have even written about it here. Unfortunately, I recently put it in the same pocket as my keys and it scratched up the screen a bunch. Light Phone support said they would fix it for $100, but I decided to fix it for $0.

• Get a tbsp of water and a tbsp of baking soda and put it into a cup.
• Put a thin piece of scotch tape over the microphone hole and speaker hole
• Get a non-abrasive cloth (I used a sock) and dip it into the solution
• Gently rub the scratches continuously in a circuluar motion until the scratches disappear!

I would say this removed the scratches 95% and it no longer bothers me. Deeper scratches might need a screen replacement.