An acid has a low PH, below 7. CLR is the opposite, a basic (caustic) solution with a PH higher than 7. What you did with CLR is to cause a chemical reaction that balanced the acid and basicity of CLR to be neutral. Baking soda will do the same thing but will be much safer. Don't know if this can happen with battery acid and CLR but mixing a strong acid with a strong base creates heat. Definately use eye protection and gloves.
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