Turn off the water supply if needed
Close the drain or place a towel in the sink
Locate the faucet screen or aerator at the tip of the spout
Wrap the screen with a cloth to protect the finish
Turn the screen counterclockwise by hand
Use pliers or an aerator key if it is stuck
Unscrew it completely and remove it
Take out any rubber washer or screen parts if they remain
Clean or replace the removed parts as needed