Turn the water off in your home by locating the water intake pipe in your home and turning the water pipe knob all the way to the left.
Close the drain of the faucet you are going to work on. You are going to be removing the aerator from your faucet, which consists of a lot of small parts. You do not want any of them slipping down the drain.
Remove the aerator from your faucet. The aerator is the tip of the faucet that allows water to flow out. Use your wrench to unscrew the faucet opening, also known as the body of the aerator. This is where the actual water flows out of the faucet. This will allow you to remove the rest of the aerator, which consists of six other parts besides the body.
Locate the six remaining parts of the aerator. They will be connected in the following order: outer housing, screen, bushing, mixer, flow restrictor and a rubber washer. These are all small parts. As you remove these parts keep them in order, because once you clean them you will have to assemble them in the exact same way. View "Resources" below for a diagram of these parts.
Wash each part of your aerator with soap and water. For some parts, simply wash them off with some water. Other parts will require you to use a small brush to get the debris out. To be absolutely sure each part is clean, it is a good idea to soak them in either soap and water or white vinegar for a few minutes.
Assemble the aerator in the correct order. Start with the rubber washer, then the flow restrictor, mixer, brushing, screen and outer housing. Finally, use your wrench to reconnect the body, and you have finished assembling your faucet's aerator.