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The idea of using vinegar (aka acetic acid) is to neutralise the sodium hydroxide Sodium hydroxide + acetic acid = sodium acetate + water (both of which are non hazardous). As a chemist, this would be my choice of acid for neutralising sodium hydroxide in this environment. It is, however, important to was the area with lots of water afterwards.You would use baking soda (sodium hydrogen carbonate ) - a base - to neutralise an acid.
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