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Trial Number 0

Trial Purpose:

To measure the foam stability of light-duty hand dishwashing detergent products in the presence of artificially soiled plates.

Date Run:

07/28/2014

Experiment Procedure:

Soiled dinner plates are washed by hand in solutions of hand dishwashing detergents under standardized conditions until an end point of near-disappearance of the foam is reached, after which the number of plates washed is compared to the number of plates washed using a standard product. The guide, as now constituted, is not suitable for ranking of hand dishwashing products, since no basis is available at this time for correlation of the foam stability of these products using any particular food soil or combination of soils with consumers’ ranking of performance. Materials used included, plain white glazed dinner plates in sound condition 8 to 9 in. in diameter, with 6 1⁄4 to 6 1⁄2 in.) indented bottom; plastic dishpan (conventional) with bottom diameter = 11 in., top diameter = 14 1⁄2 in., depth = 5 1⁄2 in; sponge (any conventional brand); a reservoir of 4-L capacity, that can be readily loaded with test water and that can deliver its contents through a 3⁄8-in. (inside diameter) drainage tip with an open-shut style to permit full flow immediately upon opening.

The soil mixture used was based on the ASTM soil B: Flour - 50 %; Shortening - 48 %; Olive oil - 2 %. The shortening and the olive oil were warmed to 100°F. Then the flour was slowly added while mixing with a spatula and warming to 120°F. The temperature was held at 120+/-3°F) while soiling dishes. In order to prevent soil from melting off plates, the wash temperature was not allowed to exceed 117°F. Prewashed plates were coated with 2 grams of soil using a spatula and then spread over the surface of the plate using gloved finger. Soiled plates were then stacked in convenient sized piles (20 to 25 plates). The top plate of each pile was inverted to prevent drying out of soil. After soiling the last plate of each stack, the residual soil on the finger is removed by wiping on the sides of the stacked, soiled plates. Soiled plates were washed the same day as soiling.

Four liters of test water at desired temperature was placed in the reservoir. The standard temperature is at 40 degrees Celsius. The sponge was placed in the wash water and two squirts of the product were applied. The first dish was washed beginning at 30 seconds after the soap addition was completed. One dish was washed at a time, both front and back, using a rotating motion with the sponge while keeping the dish half submerged in an angular position with the bottom of the dishpan. A soiled dish was washed every 30 s and the process was continued until the sponge is observed to have no white soap foam left after a squeeze.
Chemistries Evaluated: Dawn Platinum dishwashing cleaner, Dawn Gentle Clean dish washing cleaner, Palmolive Original dishwashing cleaner, Palmolive Oxy washing cleaner, Ajax Triple Action dishwashing cleaner, Brand Buzz Moisturizing Shea & Aloe dish washing cleaner, Brand Buzz Basic Citrus Sage dishwashing cleaner, Brand Buzz Oxy dish washing cleaner, Brand Buzz Basic Pink Grapefruit dishwashing cleaner, Brand Buzz Heavy Duty 409 Lavender dish washing cleaner

Trial Results:

Product Start Temp End Temp # of Plates Tester
Dawn Platinum 40.1 38.7 2 1
Dawn Platinum 40.8 39 1 1
Dawn Platinum 41 38.8 2 1
Dawn Platinum 41.2 38 3 2
Dawn Platinum 40 37.8 2 2
Dawn Platinum 40.1 38.2 3 2
Average 40.5 38.4 2.2  
Product Start Temp End Temp # of Plates Tester
Dawn Gentle Clean 39.9 38   2 1
Dawn Gentle Clean 40.5 37   3 1
Dawn Gentle Clean 40.3 38.2   2 1
Dawn Gentle Clean 39.7 37   2 2
Dawn Gentle Clean 40.3 37.5   3 2
Dawn Gentle Clean 39.9 37.2   2 2
Average 40.1   37.5 2.33
Product Start Temp End Temp # of Plates Tester
Palmolive Original 40.2 37.7   2 1
Palmolive Original 40.6 38.6   2 1
Palmolive Original 40.1 38   3 1
Palmolive Original 40.9 38.8   2 2
Palmolive Original 40.8 38   3 2
Palmolive Original 40.3 38.2   2 2
Average 40.5   38.2 2.33
         
Product Start Temp End Temp # of Plates Tester
Palmolive Oxy 40.5 38 1 1
Palmolive Oxy 40.5 38.7 1 1
Palmolive Oxy 40 38 1 1
Palmolive Oxy 40.3 38.2 1 2
Palmolive Oxy 40.5 38.2 1 2
Palmolive Oxy 40.7 38.1 1 2
Average 40.4 38.2 1  
Product Start Temp End Temp # of Plates Tester
Ajax Triple Act 39.7 37 3 1
Ajax Triple Act 40.5 38 2 1
Ajax Triple Act 40 38 2 1
Ajax Triple Act 40.7 38.1 2 2
Ajax Triple Act 40.7 38.2 2 2
Ajax Triple Act 40.3 38.1 2 2
Average 40.3 37.9 2.2  
         
Product   Start Temp End Temp # of Plates
Brand Buzz Moisturizing Shea & Aloe 41 39 1 1
Brand Buzz Moisturizing Shea & Aloe 40.2 39 1 1
Brand Buzz Moisturizing Shea & Aloe 40.9 38.6 1 1
Brand Buzz Moisturizing Shea & Aloe 40.1 37.9 1 2
Brand Buzz Moisturizing Shea & Aloe 40.2 38 1 2
Brand Buzz Moisturizing Shea & Aloe 40.3 38 1 2
Average   40.5 38.4 1
Product   Start Temp End Temp # of Plates
Brand Buzz Basic Citrus Sage 40 37.9 1 1
Brand Buzz Basic Citrus Sage 40.6 39 1 1
Brand Buzz Basic Citrus Sage 41.2 39.2 1 1
Brand Buzz Basic Citrus Sage 40.3 38 1 2
Brand Buzz Basic Citrus Sage 40.2 38.1 1 2
Brand Buzz Basic Citrus Sage 40.1 38.1 1 2
Average   40.4 38.4 1
Product Start Temp End Temp # of Plates Tester
Brand Buzz Oxy 39 36 1 1
Brand Buzz Oxy 41.2 39.2 1 1
Brand Buzz Oxy 40.6 39.3 1 1
Brand Buzz Oxy 40.1 37.7 1 2
Brand Buzz Oxy 40 37.9 1 2
Brand Buzz Oxy 39.8 37.2 1 2
Average 49.1 37.9 1  
Product   Start Temp End Temp # of Plates
Brand Buzz Basic Pink Grapefruit 40.7 38 1 1
Brand Buzz Basic Pink Grapefruit 39.9 37.1 1 1
Brand Buzz Basic Pink Grapefruit 40.6 38.1 1 1
Brand Buzz Basic Pink Grapefruit 40.1 38.9 1 2
Brand Buzz Basic Pink Grapefruit 40.1 37.9 1 2
Brand Buzz Basic Pink Grapefruit 40.1 38.1 1 2
Average   40.3 38 1
Product Start Temp End Temp # of Plates Tester
Brand Buzz Heavy Duty 409 Lavender 40.2 37.2 1 1
Brand Buzz Heavy Duty 409 Lavender 39.7 38 1 1
Brand Buzz Heavy Duty 409 Lavender 39.9 37.1 1 1
Brand Buzz Heavy Duty 409 Lavender 40.1 38.1 1 2
Brand Buzz Heavy Duty 409 Lavender 39.8 37.1 1 2
Brand Buzz Heavy Duty 409 Lavender 39.9 38 1 2
Average   39.9 37.6 1
Dawn Platinum 2.17 plates
Dawn Gentle Clean 2.33 plates
Palmolive Original 2.33 plates
Palmolive Oxy 1.00 plates
Ajax Triple Action 2.17 plates
Brand Buzz Moisturizing Shea & Aloe 1.00 plates
Brand Buzz Basic Citrus Sage 1.00 plates
Brand Buzz Oxy 1.00 plates
Brand Buzz Basic Pink Grapefruit 1.00 plates
Brand Buzz Heavy Duty 409 Lavender 1.00 plates

Success Rating:

Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.

Conclusion:

The foam stability of Dawn Platinum, Dawn Gentle Clean, Palmolive Original and Ajax Triple Action had double the amount of dishes being cleaned on average than that of any Brand Buzz dish cleaning products. After squeezing the sponge; it was clear that the white foam in the soap was gone when it was observed that the soap itself only secreted orange soil scum.

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