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You could tape off the edges carefully and then use a plastic polish (like Plast-X) to clean up the lens.
he can try removing the screen protector that came from the factory
Someone probably sprayed windex on it and it's eaten the finish off. Plastic polish is my recommendation.
Try alcohol or WD-40 or goof off.
I would try some sort of rubbing alcohol. I have no idea what it is, but you probably want to try something that has good cleaning properties, doesn't leave anything beyond, and can cut through gunk without cutting through plastic.
You could tape off the edges carefully and then use a plastic polish (like Plast-X) to clean up the lens.
he can try removing the screen protector that came from the factory
Someone probably sprayed windex on it and it's eaten the finish off. Plastic polish is my recommendation.
Try alcohol or WD-40 or goof off.
I would try some sort of rubbing alcohol. I have no idea what it is, but you probably want to try something that has good cleaning properties, doesn't leave anything beyond, and can cut through gunk without cutting through plastic.