Trial Number 5

Five products from the previous trials were selected based on performance. All were used at room temperature. Two alkaline aqueous cleaners were diluted to 5% using DI water in 300 ml beakers. Three cleaners were used at full strength. Fifteen preweighed aluminum coupons were coated with Mobile DTE light oil using a handheld swab. The contaminated coupons were weighed again to determine the amount of soil added.

Each cleaner tested with three coupons. Three coupons were placed into a Gardner Straight Line Washability unit. A Kimberly Clark Reinforced paper towel was attached to the cleaning sled and soaked with 5-7 sprays of cleaning solutions. Each coupon was sprayed 3 times with the same cleaning solution. First, Coupon was cleaned for 15 cycles two times; after coupon was cleaned for 15 cycles, experimenter changed the paper towel and soaked with 5 spray of same cleaning solution. At the end of the cleaning, coupons were dried at room temperature naturally. Final weights were recorded and efficiencies were calculated and recorded.

Two of the five worked very well on the light oil, removing more than 93%. Two other products removed just under 85%. The Activeion unit had the lowest efficiency at 74%. However, two of the three coupons had removal rates higher than 90% and one lower then 40%. A reevaluation of this product will be conducted to determine effectiveness. The table lists the amount of oil added, the amount remaining and the efficiency for each coupon cleaned.

Based on past performance on the previous four contaminants, all five products will be tested on the fifth supplied contaminant under the same conditions.