Before installing a bathroom sink, make sure to shut off the water by closing the valves or going to the main supply. Mark and measure, cutting out a hole in the countertop to fit the sink. Refer to the manufacturer's instructions for the sink installation, using provided tools. Use a waterproof sealant around the edges of the cut out (area between the sink and counter surface) to prevent water leaks or rot. Lower the sink into the hole, making sure the seal of the caulk is secure. The next step is to install the drain, connecting it to the hole underneath the sink and sealing it with putty and caulk. Connect the water lines and allow all of the sealant to dry for 24 hours.

To clean a bathroom sink drain, regular maintenance is required to prevent clogs. The pop-up stopper or guard on the sink should be taken off to remove any debris that has collected. Rinse and replace both the stopper and drain guard. Home items such as baking soda, vinegar, and lemon juice can be used to clean the sink with hot water being poured down the drain afterward.