Using this 4 oz round liquid pump dispenser is a breeze. First, fill it with your desired liquid like acetone for nail services or makeup remover. To use, just press the pump. When you're done, twist the top counterclockwise to lock it and prevent any leaks. As for maintenance, it's a good idea to clean it regularly. Empty the remaining liquid and wash it with warm soapy water. Rinse thoroughly and let it dry completely before refilling. Also, keep it away from extreme heat or cold to ensure its proper functioning.