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Office of Competition and Consumer Protection

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#UOKiKtestuje - we test dishwashing liquids

< previous | next > 23.12.2020

#UOKiKtestuje - we test dishwashing liquids
  • Check which of the dishwashing liquids available on the Polish market removes dirt and grease most effectively.
  • 66 tests, 2 270 results - UOKiK presents the results of the latest test.
  • In a month, we will test diapers for children. Visit uokik.gov.pl and see the latest report.

Difficult to remove dried out food residues? Problem with washing a greasy frying pan? Which dishwashing liquid can easily handle grease and dirt, and its pH is suitable for hand skin – you will learn from the latest report #UOKiKtestuje.

- We are on the consumers' side and support them in making their purchasing decisions based on reliable data. In the third report from the cycle "UOKiK testuje" (UOKiK tests) we compare the performance of 10 dishwashing liquids that we tested in our laboratories – says President of UOKiK Tomasz Chróstny.

How did we choose dishwashing liquids?

We tested the 10 most popular brands of dishwashing liquids selected on the basis of market research, which was conducted for us by the Trade Inspection Authority in supermarkets, discount stores and drugstores. Four of them are private labels: Lewiatan, Lidl and two from Biedronka chain. All liquids, according to the adopted assumptions, contained from 5 to 15 percent anionic surfactants and less than 5 percent non-ionic surfactants and/or amphoteric surfactants.

The tests were carried out by employees of the UOKiK accredited laboratories in Bydgoszcz and in £ód¼, in September and October 2020. The liquids passed a total of 66 different tests, during which we obtained 2 270 partial results.

What did we test?

We investigated a number of key parameters affecting the quality and comfort of washing. First of all, we examined the washing power of liquids, i.e. their effectiveness in removing dirt. Secondly, we tested their fat emulsification properties, which determine the effectiveness of the detergent in the fight against greasy dishes. Thirdly, we checked the pH value of the products, the value of which affects the condition of the skin of the hands. Moreover, UOKiK experts estimated the cost of a single washing cycle and one litre (or kilogramme) of liquid, as well as its quality/price ratio. They also verified whether the manufacturer's declaration of the net content (weight or volume) of the product is correct.

What have we found out? Detailed results -> download the test report.

QUALITY RANKING

Based on laboratory tests, we have evaluated the overall quality of liquids. We have assigned specific values to three parameters: 60 percent - washing power, 35 percent - fat emulsification properties, 5 percent - pH value. This way we developed a quality ranking with Fairy cytryna, Pur Sekrety Kucharza Soda Effect and Ludwik cytrynowy taking first place, scoring 5 stars. Kraft cytrynowy was next in the ranking, with 4 stars.

We also calculated the cost per a single washing cycle and evaluated the quality/price ratio. It turned out that the cheapest washing cycle was achieved with Tymek: one washing cycle = one grosz.

What did the laboratory tests look like?

  • Washing power

We applied a mixture made from powdered milk, powdered yolk, wheat flour, margarine and water on white, flat plates. Its texture resembled a raw pancake dough. We left the dirty dishes at room temperature for 24 hours.

We repeated the washing process in three series, with 30 plates, for each of the tested liquid. The detergent was administered according to the test procedure, taking into account the manufacturer's recommendations. In all cases, the washing conditions were the same: we used tap water of similar hardness and temperature of 45 degrees Celsius, not softened.

Once the plates were washed and dried, we dipped them in an iodine solution for easier observation. We evaluated the look of the plates by counting the spots and streaks on each of them, awarding a specific number of points.

  • Fat emulsification properties

We added doses of coloured rapeseed oil to the water with dishwashing liquid. If a uniform emulsion was formed, we added another portion of oil until it ceased to form. The more grammes of fat the liquid is able to emulsify - the better it can handle greasy dirt.

  • pH

We checked the pH value using the so-called pH-meter by immersing the electrode in water with washing liquid. The pH value tells us about the reaction of the product on a scale from 0 to 14, i.e. its acidity (from 0 to 7) or alkalinity (from 7 to 14). The pH of healthy skin is 5-6, which is slightly acidic. The agents that come into contact with our skin should have a similar pH.

  • Net amount

We measured the weight of the product with the packaging (gross weight), and then the weight of the packaging itself (tare), after complete removal of the contents. We calculated the net weight as the difference of both these values. We verified the net volume by directly measuring the volume of the liquid in a graduated (measuring) cylinder.

You can count on the assistance of the Trade Inspection Authority

The Office of Competition and Consumer Protection kindly reminds that any objections concerning the marking, quality and safety of products may be reported to the Provincial Inspectorate of the Trade Inspection Authority.

Download the results of the third test from uokik.gov.pl. In the report you will find a comparison of the effectiveness of dishwashing liquids, tips and useful information.

Consumer support:

Phone: +48 801 440 220 or +48 22 290 89 16 – consumer helpline
E-mail: [SCODE]cG9yYWR5QGRsYWtvbnN1bWVudG93LnBs[ECODE]
Consumer advocates – in your town or district
Provincial Trade Inspection Authority Offices

Additional information for the media:

UOKiK Press Office
pl. Powstańców Warszawy 1, 00-950 Warsaw
Phone: (+48) 22 55 60 246
Email: [SCODE]Yml1cm9wcmFzb3dlQHVva2lrLmdvdi5wbA==[ECODE]
Twitter: @UOKiKgovPL

Attached files

 

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