well theres always variables, in any situation, but this just proves that with this agitator of the time, would clean a large load, and you could be sure the machine was moving all the clothes around to the lower part of the agitator where the cleaning was happening....even thogh they used a Whirlpool machine, this went on to prove, that it would clean better than any BD Kenmore/Whirlpool just the same, with a regular agitator of choice....
back to the same of which detergent, water softner, wash time...they were treating all the machines equal to the task...warm wash/cold rinse, normal cycle for that manufacturer, HIGH water level, agitation, and spin speeds...you can't get anymore better than that to compare apples to apples...your mileage may vary....in your particular region, the results would come out the same, don't you think?....
it was just demonstrating with every best scenario possible, proper water temp and softness, a good detergent, and proper wash cycle....you would know that you were getting the best cleaning that could be had from a machine, giving it a family size load....