Another method to clear Nivito kitchen sink drain is to use boiling water. Pour the water down the drain and wait for it to cool. It may clear the drain immediately, but if you find that the clog is deeper, you may need to use a plumber's snake. To use this tool, you'll need to disassemble the pipes in your kitchen sink. You'll need a P-trap (the curved part of the pipes that lead to the kitchen sink), which is typically located inside the cabinet.