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Trial Number 7

Trial Purpose:

To evaluate the longevity of the foam from a single dose of dishwashing product on a clean sponge when used according to a "neat" dishwashing procedure.

Date Run:

07/24/2020

Experiment Procedure:

Three trials were conducted for each of the three dish soap products tested; Dawn, Joy, and L'AVANT Collective. Trials were set up according to a "neat" dishwashing procedure which observes the stability of the surfactant foam by counting the number of plates washed until no foam is visible on the sponge or plate. For this test, the sponge method was used to determine the foam level by holding the product treated sponge in the palm of the hand with the detergent side up. Using a thumb, pressure is placed on the center of the sponge to observe foam. The test is considered complete when no foam is observed on the sponge.

Clean ceramic plates were soiled with two grams of DCC-18 using a spatula and air dried to cure for two hours at room temperature (68˚F). Each dish soap had a new sponge that was rinsed and wrung prior to testing with hot water remove any potential wetting agents found in the sponge and then air dried up to 10 minutes before testing. Two grams of a dish soap was added to one side of a new sponge in a figure eight motion right before a trial. Four liters of heated tap water (112°F) was placed into a clean dishpan for each product trial and the starting temperature recorded. Plates were cleaned using the detergent treated side of the sponge for 10 seconds in a circular motion with consistent pressure. After no foam was visible on the sponge, the final temperature was recorded and number of plates counted. 

Trial Results:

Product Trials Start Temp °F End Temp °F # of Plates Ave. Start Temp °F Ave. End Temp °F Ave. # of Plates
Dawn 1 110 108 6 113 107 7
2 110 104 6
3 118 108 9
Joy 1 110 110 8 115 107 10
2 118 103 11
3 116 108 10
L'AVANT Collective 1 110 102 10 112 102 11
2 113 104 10
3 114 101 14

L'AVANT Collective dish soap had more bubbles initially than the other two dish soaps and lasted the longest on average. 

Success Rating:

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

Conclusion:

L'AVANT Collective dish soap was the most effective dish soap out of the three products tested. 

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