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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usage Instruction, 1.Put 4 to 5 drops of this liquid on wet sponge and, clean the cloudy glass surface., 2.Add few drops into aquarium water and wait

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