Originally Posted by The_Bishop
A little googling pulled up this formula:
HC2H3O2 + NaCl ---> HCl + NaCH3O2
(vinegar) + (salt) ---> (hydrochloric acid) + (sodium acetate)
However, I am not a chemist and don't profess to be one. This formula may be incorrect. I know it cleans copper very, very well though.
Your equation is correct in the sense that it is a balanced equation (ignoring the missing carbon in the sodium acetate). The problem is thermodynamics. The thermodynamics of the above equation are not favorable and it will proceed in the reverse direction. The pKa of an acid is proportional to gibbs free energy (free enthalpy)
To the original poster. The composition of of oxyclean is mostly sodium carbonate/sodium percarbonate. When divalent cations (Ca2+ Mg2+) are mixed with carbonates in a high pH high temperature environment a precipitate is formed assuming you have a quantity exceeding the solubility in those conditions. This would happen in water containing high levels of Calcium and Magnesium ions. The solubility decreases as pH increases and temperature increases (inverse solubility). This means that using a cold acidic solution will remove the carbonate precipitate.