Washing soda is a natural alkaline cleaning agent, often used as a laundry booster to remove stubborn stains and grease. It can also be used to soften hard water. Please wear gloves when using as it is a strong alkaline. As a laundry booster add 1/4 to 1/2 cup to wash cycle to brighten clothes and soften water allowing laundry soaps or detergents to work better. As a stain remover dissolve in hot water to soak and pretreat stains before laundering. Washing Soda has many diverse uses. Google can offer you many more ideas of how to use this natural cleanser. Ingredients: sodium carbonate.