The concentration of the HCL is not that crucial-provided it is just HCL it will do fine.The more concentrated it is, the less you will need to use.
I bought several litres of HCl at 16% concentration from a place that supplies materials to the building trade; it is made for cleaning bricks and removing graffiti.
Using Vovins tek, 3 or 4 drops of this added to 600ml of warmed distilled water gets the pH down to 3-4; it works like a charm!
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