Liqui-Nox® Critical Cleaning Liquid Detergent Liqui-Nox Precision Liquid Detergent is a concentrated, anionic liquid product formulated for either manual or ultrasonic use. It has furthermore been designed to be free rinsing (e.g. easily rinse off in running water) to yield completely residue free surfaces. It is extremely mild and completely soluble in hard and soft water. In most respects, it produces the same kind of end result as Alconox® Powdered Detergent but without the inconvenience of having to dissolve the powder first.