How to Clean Cubic Zirconia
To clean cubic zirconia, dip the jewelry in a mixture of warm water and mild dish detergent. Scrub the cubic zirconia with a soft-bristled toothbrush to remove dirt and debris. Rinse the piece under cool running water, making sure to remove all soap residue, then pat the cubic zirconia dry with a soft, clean cloth.
Mix warm water with mild dish detergent. Abrasive cleaners can damage cubic zirconia. All you need is some mild dish detergent from your kitchen and a bit of warm water. The precise ratio of detergent and water for a routine cleaning does not have to be exact, but strive for about one part detergent to two parts water. Scrub your cubic zirconia with a soft-bristled toothbrush. You can dunk the jewelry briefly to get it wet. You can also simply apply your water/detergent mixture to your toothbrush. Gently scrub down your cubic zirconia with a soft-bristled toothbrush to remove dirt and debris and achieve a healthy shine. If you don't have a spare toothbrush on hand, cubic zirconia can also be cleaned with a soft cosmetic brush. A brush used for eye shadow, for example, would work well. Rinse your cubic zirconia completely. It's important not to leave any soap residue on cubic zirconia. After washing your cubic zirconia, rinse it under the faucet until the water runs clean. Pat dry your cubic zirconia with a soft cloth. Letting cubic zirconia air dry can cause damage. Use a clean cloth to gently dab the zirconia dry. Keep dabbing until there is no moisture left on the jewelry. Mix detergent and water. In the event a routine cleaning does not restore cubic zirconia's luster, follow up by soaking it. Make a soak for the jewelry using three parts hot water and one part mild dish detergent. Submerge your cubic zirconia in the mixture. Gently set your cubic zirconia in the water/detergent mixture so it's fully submerged. There is no precise amount of soaking time required, but let the gem sit for at least a couple of minutes. Rinse and dry your cubic zirconia. Under the faucet, rinse the mixture off the cubic zirconia. Rinse it until the water runs clear. Then, pat the zirconia completely dry with a clean cloth. See a jeweler if this does not work. If both cleaning and soaking do not restore cubic zirconia's shine, it's time to seek professional treatment. A high-pressure steam clean may be needed, which should be done by a professional jeweler. Clean cubic zirconia once a month. Monthly cleaning is needed to prevent the build-up of dirt and grime on cubic zirconia. If you're consistent with monthly cleaning, this reduces the likelihood the jewelry will build up dirt to the point professional cleaning is required. Keep cubic zirconia away from lotions and oils. If you wear cubic zirconia on your hands, avoid using lotion or things like essential oils. Cubic zirconia is sensitive to such substances and can easily be damaged. If you do use lotion or oils, keep it away from any cubic zirconia you're wearing. Avoid harsh cleaners. Bleach, chlorine, and ammonia should not be used on cubic zirconia. Do not use any chemical cleaners to remove harsh stains, as this can easily damage your jewelry. Store your jewelry safely. Cubic zirconia should be stored in an airtight container to prevent wear and tear. Any time you're not wearing cubic zirconia, store it promptly and in a safe container. 
Mix warm water with mild dish detergent. Scrub your cubic zirconia with a soft-bristled toothbrush. Rinse your cubic zirconia completely. Pat dry your cubic zirconia with a soft cloth. Mix detergent and water. Submerge your cubic zirconia in the mixture. Rinse and dry your cubic zirconia. See a jeweler if this does not work. Clean cubic zirconia once a month. Keep cubic zirconia away from lotions and oils. Avoid harsh cleaners. Store your jewelry safely. 