Photo: Ulrich Schepp

Facts about the test

Testfakta was commissioned by Reckitt Benckiser to carry out a comparative laboratory test of dishwasher detergent tablets for the Swedish market. The starting point for the test was to compare the cleaning effectiveness and shine for a representative selection of all-in-one products on the Swedish market.

The selection included the following products:

  • Finish Quantum
  • Finish Power & Pur Quantum
  • W5 Dishwasher tablets
  • Coop All in 1
  • Sun All in 1
  • Finish All in 1
  • Yes Powerdrops
  • Yes Platinum
  • ICA Maskindisktabletter
  • Hemköp Maskindiskmedel
  • Grumme Maskindisk
  • Favorit Maskindisk

 

Testing

The laboratory tests were carried out by SGS Insitut Fresenius in Tanusstein, Germany. The laboratory tests were carried out according to recommendations from the trade and industry association IKW and the laboratory’s own methods. All test stages were carried out at a dishwashing temperature of 50 degrees Celsius and in soft water (5 dH).

The laboratory tests included the following aspects:

  • Cleaning effectiveness
  • Rinsing effectiveness
  • The ability to counteract the occurrence of spots, coatings and grey films

 

Cleaning effectiveness

Cleaning effectiveness was tested on 7 different types of food residues/spots which could be divided into three categories on the basis of their composition – bleachable, protein-based and starch-based. The different food residues/stains were applied in the test on different types of medium – plates, cups and baking trays.

  • Starch-based: dried-on porridge (medium – porcelain plates)
  • Starch-based: dried-on residues from potatoes, corn, rice and wheat (medium – porcelain plates)
  • Protein-based: dried-on mince with egg (medium – porcelain plates)
  • Protein-based: dried-on mixture of egg and milk (medium – stainless steel baking trays)
  • Protein-based: dried-on egg yolk (medium – stainless steel baking trays)
  • Protein-based: burned-on milk (medium – porcelain bowl)
  • Bleachable: dried-on tea (medium – porcelain cups)

The reported results consisted of average values from 5 test batches per food residue/stain and brand. The laboratory’s results were reported on a scale from 1 to 10 where 10 is completely clean (no residues).

 

Rinsing effectiveness

The effectiveness of rinsing was tested in two stages. The occurrence of stains and the occurrence of grey coatings after rinsing. In the test, the dishwasher was loaded with 5 different media (see below) which had been treated with starch, egg white and vegetable and animal fat. After the end of the dishwasher programme, the dishes were left to rest for 10 minutes with the door open to cool. After this the rinsing effectiveness was measured in a “black box” with defined light conditions. Using this tool it is possible to see clear traces of dried drops, stripes, residues or grey films on the various media. Glasses were assessed both visually and using a digital image analyser. The reported results are average values from three repetitions per medium. The laboratory’s results were reported on a scale from 1 to 8 where 8 was completely clean (no grey film/coating or stains).

The dishes consisted of the following media:

  • Blue melamine plates
  • Black glass plates
  • Black porcelain plates
  • Tall drinking glass
  • Stainless steel knives

 

Ability to counteract the occurrence of grey films/coatings

The dishwasher detergent’s ability to counteract the build-up of grey films/coatings was tested on a total of 30 cycles per dishwasher detergent brand. In the test, the machine was loaded with three different media (see below) which had been treated with tomato ketchup, mustard, sauce, potato starch, benzoic acid, egg yolk, margarine and milk. After the dishwasher programme had finished, the dishes were allowed to cool for 30 minutes. The clarity/shine was visually evaluated after 10, 20 and 30 repetitions. The reported results are average values from 10, 20 and 30 repetitions per medium and brand. The laboratory’s results were reported on a scale from 1 to 8 where 8 was completely clean (no grey film/coating).

The dishes consisted of the following media:

  • Crystal glass
  • Porcelain
  • Stainless steel cutlery

 

Scoring

Testfakta’s scoring follows the laboratory’s reporting, but with a scale from 1 to 5 where 5 corresponded to completely clean (no residues), stains or grey film.

  • Score 1 corresponded to a very unsatisfactory result
  • Score 2 corresponded to an unsatisfactory result
  • Score 3 corresponded to an medium good result
  • Score 4 corresponded to a satisfactory result
  • Score 5 corresponded to a very satisfactory result

The scores from the different test stages were weighted together to a total score where the scores from the different test stages had the following weights:

Cleaning effectiveness 65%

  • Starch-based residues 25%
  • Protein-based residues 25%
  • Burned-on milk 25%
  • Bleachable stains 25%

Shine 35%

  • Rinsing effectiveness 33%
  • Ability to counteract grey films/coatings 67%