Compositions for visualization of cleaning efficacy and product coverage

A method of processing a food, an animal hide or a hard surface comprising:

• applying a composition to a surface of the food, the animal hide or the hard surface to form a treated surface;
• visually inspecting the treated surface under ultraviolet light to detect fluorescence on a portion of the treated surface where contamination remains;
• after the applying and visually inspecting steps, rinsing the treated surface with water;
• cleaning the portion of the treated surface where the contamination was detected;
• reapplying the composition to the portion of the treated surface where the contamination was detected;
• and
• repeating the visually inspecting, rinsing, cleaning, and reapplying steps until no fluorescence is detected on the treated surface,
• the composition comprising glycerol monolaurate;
• riboflavin;
• citric acid or salt thereof;
• and water;
• wherein the composition is a solution having a pH ranging from 1 to 7, and the ratio of glycerol monolaurate to riboflavin ranges from 1:2 to 200:1;
• wherein the composition, when applied to the surface of the food, the animal hide, or the hard surface in an amount containing from 1 ppm to 100 ppm riboflavin, has greater adherence to the surface and covers a greater area of the surface than the same amount of the same composition which does not contain glycerol monolaurate;
• and
• wherein the composition adheres to the contamination and fluoresces under ultraviolet light after rinsing the treated surface with water.