To test, Consumer Reports takes glasses coated with a mixture of flour, egg yolk, sugar, and evaporated milk then puts it in an oven for ten minutes in order to simulate baked-on food. After the glass cools, testers place it in a scrubbing machine with warm water and one teaspoon of detergent. A counter then tallies the number of scrubs it takes to remove the food.
Sounds more like they were baking a delicious dessert rather than testing the liquid cleaner.
Anyhow, the two top performers of the bunch were Dawn Direct Foam and Ajax Lemon Dish Liquid, but the testers noted that "even the lowest-rated product will get dishes clean if you scrub long enough". The more expensive brands just do it quicker. Time may mean money, but we think we'll stick with our favourite for now (or the stuff from the 99 Cents Only Store).