You may have installed a beautiful new top-of-the-range sink but, without attention, waste disposals and sink drains can soon become pretty unpleasant. You can keep you sink drain as good as new using a simple mixture of vinegar and baking soda. It really is that simple. The only problem with using vinegar and baking soda in the kitchen sink is that it is a liquid, which means it slips down the drain very quickly. If you find this is happening when you clean your kitchen sink, try adding some liquid detergent. Squirt the liquid soap carefully so that it covers the sink drain walls, then add the baking soda, which will stick to the soap. Finally, pour in the vinegar. If you are lucky, the mixture will cling to your sink drain for at least ten minutes, ensuring you achieve an excellent clean.