Two solutions were prepared to the following concentrations: Metalnox 6386 100% and SC Aircraft & Metal Cleaner 30%. Solutions were added to a heated ultrasonics bath at 120°F. One aluminum mirror polish part pre-soiled with buffing compound was obtained for each cleaner. Photos were taken before cleaning as well as a white glove test to verify presence of soil. Once solutions reached the proper temperature, parts were submerged into their respective cleaners and heated ultrasonics was conducted for 15 minutes. At five-minute intervals, parts were removed from solution to take observations on the cleaning process. After 15 minutes, the part cleaned with SC Aircraft & Metal Cleaner was submerged into a deionized water bath for 30 seconds. Both parts were then dried with a heat gun and set aside for 24 hours. After 24 hours, observations of cleaning were recorded, post treatment photos were taken, and another white glove test was conducted to verify removal of soil.
Increasing concentration of SC Aircraft & Metal Cleaner did improve soil removal. Both cleaners were very effective at removing buffing compound from aluminum mirror polished parts via heated ultrasonics. Though 10 minutes removes almost all soil, 15 minutes ensures thorough cleaning. A deionized water bath is necessary when cleaning with SC Aircraft. Next steps would be to discuss results between the company and lab management.