Careful about using any cleaning product on coated glass (anti-static/reflective/glare) as many new TVs do.
Often a purplish refelction means the screen is coated. For these simply use water and kitchen roll. Dry thoroughly with dry kitchen roll. For stubborn marks use a **little** hand soap. And repeat as before.
Screen should then be as good as new!
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"In three words I can sum up everything I've learned about life: It goes on." Robert Frost.
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