Sodium carbonate (Na2CO3) and potassium carbonate (K2CO3) react with water to form an alkaline solution that has detergent properties. These compounds are present in:

The ashes of plants

Explanation:

Sodium carbonate is found in large natural deposits. It is also present in the ashes of sea plants.

Potassium carbonate is the main component of potash, which includes various mined potassium salts. It is also present in the ashes of land plants.

Neither compound has detergent properties.

Rather, the carbonate ion acts as a water softener. It removes calcium and magnesium ions that interfere with the actual detergents.

Also, the solutions are strongly basic. The hydroxide ions react with the fats and oils that stain clothes and convert them to soluble compounds that can be washed away.