Three products were selected from previous trial based on effectiveness. Each product was diluted to 5% using DI water in 600 ml beakers. Each solution was heated to 150 F in a Branson 3510 ultrasonic tanked filled with water. The solutions were degassed for 5 minutes.
Three stainless steel rings without lacquer finish but were coated with Jackonslea Grey Color 305 A (1344-28-1) were cleaned in each solution for 5 minutes using 40 kHz ultrasonic cleaning. Rings were rinsed for 15 seconds in 120 F tap water and dried using compressed air at room temperature for 30 seconds. If the rings were not completely clean after the initial 5 minutes, the rings would be cleaned for another 5 minutes. In addition, if the rings were not completely cleaned after 15 minutes, new concentrations would be tested (10 and 20%).