The salt has to be dissolved in the vinigar. After that you put the brass in and see the oxydation being eaten away in bubbles. (i dont know the mixture) I did put about 2 spoons in 250cc of vinigar. The brass looks like red copper as it comes out but a quick clean with brasso makes it nice golden again. This week i cleaned an old art deco lamp that someone had hanging outside. The parts were about 15 miniutes in the solution, than rinced under a running tap, dried and polished on the polishing wheel, shiny like new... Good luck.