The following is a list of actions that can be followed in order to clean a bathroom sink thoroughly:

Use a brush or toothbrush with soft bristles to clean the sink of any debris or filth that may have accumulated there. This will assist in removing any filth or soap scum that has built up at the bottom of the sink.

To remove any loose dirt or debris from the sink, give it a good rinsing with plenty of water.

Create a cleaning solution by combining water and vinegar in equal parts. A few drops of dish soap can also be added to the solution in order to assist in cutting through any grease or oil that may be present.

Apply the cleaning solution to the sink using a rag or sponge that has been thoroughly cleaned. Make sure that the solution gets into all of the nooks and crannies that there are.

Let the cleaning solution sit on the sink for at least 10-15 minutes to allow it to penetrate and loosen any dirt or stains.

Scrub the sink with a clean sponge or cloth that has been dampened with water to remove any grime or stains. Scrubbing the sink with a toothbrush or another tiny brush with bristles that are very firm could be necessary if the sink is particularly discoloured or unclean.

To remove any traces of filth or cleaning solution that may be left behind, give the sink a thorough rinsing in clean water.

Make sure the sink is completely dry by using a fresh towel or cloth.

If your sink is extremely discoloured or has hard water deposits, you may need to use a specialised cleaner that is created exclusively for eliminating these kinds of stains in order to successfully clean it. When working with these goods, make sure you exercise caution and follow the directions provided by the manufacturer.