Updated 17 Sep 2018
Bottom line: This tablet dishwasher detergent performs OK overall and costs 59¢ per wash. It's very good at removing egg-yolk, baked-on cheese and minced-meat stains, and it's OK at removing red wine and coffee stains, but it's extremely poor at removing rice stains.
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Overall score is the average of 6 scores for stain removal.
We test in a controlled lab environment using plates that are pre-stained. We get the plates from the same company that supplies consumer organisations and dishwasher manufacturers globally. We set the dishwasher to a standard cycle at 60°C and test each detergent 4 times. To see how well the detergents have cleaned the plates, we measure the reflectance with a spectrophotometer before and after cleaning.