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The plates in our test sink are pre-soiled with a combination of oils, milk powder, gravy, flour, vegetable stock and carbon, to simulate common stains. We wash the plates using a mechanical scrubbing arm, using 5ml of detergent in a 5L sink. Reflectiveness is measured before and after scrubbing with a spectrophotometer. Each detergent is tested 8 times with the average used as the final performance score.
Many detergents in our test come in various pack sizes and fragrances. These have no effect on their performance.
This information is available to Consumer members only.