Washing soda, also known as sodium carbonate, is a chemical compound that is frequently used in DIY and commercial laundry detergents. It is a white, odorless, water-soluble salt that yields alkaline solutions in water. Washing soda is different from baking soda, which is the common name for sodium bicarbonate. It is made by heating baking soda to high temperatures, which causes it to release water and carbon dioxide and transforms it into washing soda. Washing soda is a highly alkaline compound that can be used for various cleaning and laundry applications. Some common uses of washing soda include:

• Laundry: Washing soda is a staple in laundry rooms because it can remove a wide variety of stains from clothing, including coffee, blood, and grease. It can be dissolved in water to create a pre-soaking solution for tough stains.

• Water Softening: Washing soda can be used to mitigate the problems associated with "hard water" by binding to the minerals in the water, allowing the detergents to lift dirt from fabric.

• Cleaning: Washing soda can be used to remove coffee and tea stains from ceramics or grease from pots and pans. It can cut through soap scum in your bathroom and even clean out a clogged drain.

• Textile Art: Sodium carbonate is also used by some textile artists to help dyes adhere to fabric.

Washing soda is safe and non-toxic, but it is very caustic and not edible. It should be handled with care, and gloves should be worn when touching it with your hands.