Hydrochloric acid (HCl) has a wide range of industrial and commercial applications, including:

1. Chemical Manufacturing: Hydrochloric acid is used in the production of a wide range of chemicals, such as PVC plastics, fertilizers, dyes, and pharmaceuticals.
2. Metal Cleaning and Etching: It is used to clean and etch metals, such as steel and copper, in various industrial processes.
3. Oil and Gas Industry: It is used in the oil and gas industry to remove impurities from oil and gas wells.
4. Food Processing: Hydrochloric acid is used in the food processing industry to control the pH of foods and to adjust the acidity of certain food products.
5. Water Treatment: It is used in water treatment plants to control the pH of water and to remove minerals and impurities.
6. Leather Processing: Hydrochloric acid is used in the leather industry to remove unwanted hair and to adjust the pH of the hides.
7. Pharmaceuticals: It is used in the production of certain pharmaceuticals, such as aspirin and antihistamines.
8. Cleaning Agents: Hydrochloric acid is used in cleaning agents, such as toilet bowl cleaners and tile and grout cleaners, due to its ability to dissolve mineral deposits and other stubborn stains.