Here are the steps to follow:

1. Turn off the water supply to the sink by closing the shutoff valves located under the sink.

2. Locate the aerator at the tip of the faucet. It's a small mesh screen that screws onto the end of the faucet.

3. Use pliers or an adjustable wrench to carefully unscrew the aerator from the faucet. Be sure to hold onto it tightly to prevent it from falling down the drain.

4. Once the aerator is removed, inspect it for any visible debris or buildup. Use a soft-bristled toothbrush or a small brush to scrub away any dirt or mineral deposits.

5. Soak the aerator in a bowl of white vinegar for at least 30 minutes to help dissolve any stubborn buildup.

6. Rinse the aerator thoroughly with water to remove any remaining debris and vinegar.

7. Reattach the aerator to the faucet by screwing it back on. Be sure to tighten it securely, but not too tightly, to prevent any leaks.

8. Turn the water supply back on and test the flow of the water. If it's still slow or weak, repeat the cleaning process or consider replacing the aerator.

Cleaning the aerator in your bathroom sink or standard faucet is an easy and effective way to improve the flow of water and prevent clogs. It's recommended to clean the aerator every 3-4 months to ensure optimal performance.