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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.