Question 813524
How much depends on the equivalents of hydroxide ion present in your parcocleaner.  Either read the documentation which comes with parcocleaner, or find the amount of equivalents of hydroxide by titration.  


You might need to DILUTE your parcocleaner very much  BEFORE adding your 1:1 sulphuric acid; because adding concentrated sulphuric acid to any base can be extremely dangerous.  Such addition will generate a great amount of heat and can cause explosive boiling.