The term "dishwashing liquid" is often used interchangeably with "dish soap" to refer to the same product. While the specific choice of terminology may vary depending on regional or personal preferences, the two terms generally describe the same type of product used for washing dishes.
The term "dish soap" is more commonly used in North America, whereas "dishwashing liquid" is a more widespread term used in other parts of the world. Both terms essentially refer to a detergent specifically formulated for hand-washing dishes.
The term "liquid" is used to emphasize the product's physical form, as it is typically a viscous liquid that can be easily dispensed from a bottle or container. Additionally, using the term "dishwashing" clarifies the purpose of the product, indicating that it is specifically designed for cleaning dishes.
In summary, the terms "dish soap" and "dishwashing liquid" are often used interchangeably to describe the same product, with slight variations in usage depending on geographical location and personal preference.