Human: What are the steps to cleaning a porcelain sink? Assistant: 

1. Start by turning off the water supply valves so there is no water running into the sink.
2. Remove any items from the sink and clear away any clutter from the drain.
3. Apply a generous amount of a mild and gentle cleaner, such as baking soda, to the sink and rub it in gently.
4. Allow the cleaner to sit for 5-10 minutes.
5. Rinse the sink with warm water.
6. Use a non-abrasive sponge or rag to scrub off any stuck-on residue.
7. Rinse the sink again and wipe it dry with a cloth or towel.