A test which monitors the cleaning efficacy of your ultrasonic bath. The indicator strips have been designed to represent typical soiling that would occur during normal use of reusable surgical instruments. The test strips can be used in the mesh design holder and should be placed in a basket within the ultrasonic bath. As the activity occurs, the red test soil will be removed from the strips and different levels of soil removal will indicate different levels of ultrasonic activity. This is a bench marked performance test which is suitable for validation. The indicator strips mimic occluded surfaces to present a realistic ultrasonic cleaning challenge.