Many people are installing granite counter tops for their durability and beauty. Most granite counter tops are polished and using the wrong cleaner can damage the finish. Never use homemade cleaners with lemon juice or vinegar. They're acidic and will damage the granite over time. You should also avoid harsh or abrasive cleaning products. A mild dish soap and hot water should work well. pH balanced dish soap will be the gentlest. Be sure to apply the recommended penetrating sealer at least once a year to keep the granite looking its best. If you have a small scratch or discolorations you can try using fine steel wool to polish out the blemish. If in doubt about the care of your granite, speak with your installer. They will know the exact makeup of your granite and will be able to give you specific care tips for your particular granite.