Repeat until your headlights lose some of their yellow hue. Rinse your headlights thoroughly and dry. To further protect the lenses, apply a coat of car wax. Use a clean, soft rag to rub the wax on in a circular motion, and buff out after a few minutes.
Sodium bicarbonate (IUPAC name: sodium hydrogen carbonate) is a chemical compound with the formula NaHCO3. It is a salt composed of sodium ions and bicarbonate ions. Sodium bicarbonate is a white solid that is crystalline but often appears as a fine powder. It has a slightly salty, alkaline taste resembling that of washing soda (sodium carbonate). The natural mineral form is nahcolite. It is a component of the mineral natron and is found dissolved in many mineral springs.
The bicarbonate ion is the conjugate base of carbonic acid, a weak acid. Therefore, it reacts with water in the following fashion: $HCO_3^-(aq)+H_2O(l)\rightleftharpoons H_2CO_3(aq)+OH^-(aq)$. Because it is capable of deprotonating water and yielding a basic solution, sodium bicarbonate is a basic salt.