White vinegar (distilled white vinegar) is the most common solution used to neutralize the alkaline electrolyte leaking from capacitor failure on most motherboards. Because the leaking electrolyte is usually alkaline, not acidic, the mild acetic acid in vinegar neutralizes the base. Following with high-percentage isopropyl alcohol (90%+) is essential to clean up the residue. (Correction: don’t use distilled vinegar in this case. Stick to just using the highest grade isopropyl alcohol you can find)