Cloudy Aquarium Glass After cleaning

This is my 55 gallon tank. It was just used for fish but I am now trying to sell it. I noticed once I brought it outside that the glass was extremely cloudy. I tried to scrub the glass with a non abrasive sponge and some white distilled vinegar but that didn’t work. I’m afraid I have no idea how

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permanently cloudy glass

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Should my tank go cloudy after water changes (after water change first photo before water change second photo) : r/Aquariums

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Why is my fish tank getting dirty so quickly, like a day or two after I clean it? - Quora

How to Clean a Fish Tank: Freshwater Tank Instructions

My freshwater fish tank has been cloudy for weeks after I set it up. What's the reason and how do I solve that problem? - Quora

Water still cloudy after new filter installed and gravel cleaning : r/ Aquariums