White coating on dishes after the dishwasher

White coating on dishes after the dishwasher

Your dishwasher has been delighting you with the impeccable quality of washing for a long time, when suddenly, after the next use, you notice that a strange white coating, streaks, stains remain on the dishes … This is very noticeable in pans with non-stick (Teflon) coating.

Perhaps you found the same plaque on the walls of the dishwasher itself. What is it? Malfunction? Or did you do something wrong? Let’s figure it out.

White coating on the dishes and inside the dishwasher – what to do and how to get rid of

If there is a whitish coating on the dishes after the dishwasher, do not rush to call the service center. In most cases, you can fix the situation on your own.

The table contains possible causes of occurrence and ways to eliminate them yourself.

Signs Possible reason Remedy
After washing, white lime deposits remain on the dishes and / or on the inside of the dishwasher. The water hardness level is incorrectly adjusted. The salt supply is set to too soft water. For high-quality washing, the dishwasher needs water with a low content of calcium and magnesium salts (the so-called “soft”). To obtain such water in dishwashers, regenerating salt is used, which is poured into a special device for softening water.

It is important to precisely program the machine for the hardness of the water in your water supply already at the first use.

It is necessary to find out the hardness of the water in the water supply and adjust the salt supply to the value obtained. Some dishwashers come with special test strips designed for this purpose. You can also find out the hardness of the water from your management company .

You can find step-by-step instructions for adjusting the salt supply for your dishwasher in the instruction manual.

A new or recently installed dishwasher leaves white marks on dishes and/or oven walls.
Limescale deposits on dishes and/or dishwasher walls. The low salt indicator on the control panel is lit. The water softener salt has run out. For some time without salt, the machine can wash dishes normally, but, in the future, the formation of plaque is inevitable. You need to add salt to the container. As a rule, it is located at the bottom of the dishwasher. You can find more detailed information in the instructions.
Dishwasher doesn’t clean dishes well. Lime scale has formed on the surfaces inside the dishwasher (walls, bottom, spray arms, dish drawers, etc.). After washing, dirt and greasy deposits collect on the bottom of the unit. There may also be a white coating on the dishes. The dishwasher needs cleaning. In the process of long-term operation:
  • food residues clog the pre- and fine filters that protect the drain pump from contamination;
  • scale is deposited in the form of limescale on the inside of the dishwasher.

Clogged filters cause food residues after washing to collect on the bottom of the dishwasher instead of settling in the filters. Limescale narrows the holes in the sprinklers, so the water pressure drops and the thickness of the jets washing the dishes decreases. All this reduces the quality of washing dishes.

In addition, scale from the internal parts of the dishwasher can be deposited on the dishes in the form of whitish streaks.

Regularly check the coarse and fine filters for contamination. Clean them if necessary. To clean the dishwasher from scale 2 – 3 times a year, run the machine without dishes with citric acid, vinegar or a special cleaner on a program with a maximum temperature. Citric acid, vinegar or a special agent should be poured / poured into the powder compartment.
White stains on dishes after washing. Before washing, you added salt to the salt container. Regenerating salt has entered the washing chamber. This could happen for the following reasons:
  • you spilled salt on the bottom of the dishwasher when you poured it into the container;
  • the lid of the salt compartment is not closed tightly, warped when closing, or a crack has appeared in it;
  • you put salt in the powder or rinse aid compartment.
After adding regenerating salt, carefully clean the loading area of ​​any residue and tighten the lid of the salt container tightly. If the lid is damaged, the dishwasher must not be used. To avoid corrosion, manufacturers recommend adding salt just before starting the machine with dishes. If you do not plan to wash the dishes in the next few hours, then after loading the salt, start the empty machine on the shortest program.
After washing in the dishwasher, white stains remained on the dishes. Problems with detergents: incorrect dosage, low-quality detergents, errors when loading detergents. A very common reason. White plaque can leave:
  • low-quality washing powder, or its excessive amount when loading;
  • low-quality dish rinse / lack or small amount of conditioner;
  • unsuitable or poor-quality detergent in the form of 3 in 1 tablets;
  • loose closing of the lid of the rinse aid container – in this case, the agent flows out even at the washing stage;
  • errors when loading the rinse aid: they filled it in the wrong place, for example, with detergent;
  • use of 3 in 1 washing tablets on short programs (they simply do not have time to dissolve completely).
Try changing detergents or changing their dosage. As practice shows, the choice of the optimal manufacturer of powder and rinse aid, as well as their dosages during washing, depend on the operating conditions of the dishwasher and are selected only empirically.

Also read your dishwasher manual carefully and don’t confuse the detergent compartments.

Malfunctions in which white marks remain on the dishes and the inside of the dishwasher

The appearance of white spots on the dishes and / or the walls of the dishwasher after use rarely indicates a technical malfunction of the unit. However, such problems are possible.

Sign Possible cause and remedy
Dirt and greasy deposits accumulate on the bottom of the unit after washing. Dishes don’t wash well. Lime scale on surfaces and parts inside the chamber (sprinklers, dish drawers, walls, etc.). White stains on dishes after washing are also possible. The dishwasher needs a thorough cleaning. Food residue clogs the pre- and fine filters and makes it difficult to drain the water. Scale builds up on the inside of the dishwasher (even though water softening salt is used) and prevents water from splashing. These factors reduce the quality of the wash. It is necessary to clean the filters of the dishwasher from dirt and run the dishwasher with a special descaler on the high temperature wash program.
After each use, white spots, streaks or deposits form on the dishes. Faulty water hardness sensor (if any). Expensive models of dishwashers (for example, some Miele brand units) are equipped with a special sensor for automatically detecting water hardness, which controls the consumption of regenerating salt during the dishwashing process.

In such machines, it is not necessary to adjust the salt supply before the first use.

If the sensor fails, the dishwasher’s software module receives incorrect information about the hardness of the water, and the water is not “softened” enough.

The water hardness sensor needs to be replaced.

But my problem is less clear to me. The new machine washed dishes for six months without any problems. All the materials were of good quality (I will not do advertising), changed in a timely manner, salt, rinse aid, etc. Then, at some certain moment, a white coating suddenly appeared on the dishes and on the surface of the chamber. I washed the filters and ran two control washes in different modes and at different water hardness settings. The result is zero. I bought a wash from a well-known manufacturer and started cleaning in the hardest mode. The car was washed and shined like new. No problems for the next three months. Then it all happened again, quite unexpectedly and with the same symptoms. Filter checks again, repeated washings in different modes, changes in hardness settings. The result is zero. What is the reason? Do you clean again? Help me to understand. The car is simple

Master’s answer: you need to check the water hardness sensor of your dishwasher. The water may be too soft, preventing the dishes from being rinsed.

Hello. The machine is compact BOSCH SKT 3002 EU. There was a problem with salt. It ends very quickly, enough for 1-2 washes. And a strong white coating is formed. I began to pour a little before each washing of dishes. But this partially solved the problem – sometimes it reappears. But the main thing that worries is the rapid dissolution of salt. Probably because of this, the plaque appears. Tell me what could be the reason

Master’s answer: you need to check the salt sensor and the flow sensor of your dishwasher, if the salt has not been consumed so quickly before.

But what if, by mistake, after adding salt, the valve remained open and washed the dishes with the valve open (and after that now a white coating remains on the dishes every time.

Master’s answer: It is necessary to wash off all the water from the pan and rinse all residues by rinsing

How can you determine the hardness of water. If there is no sensor?

Master’s answer: you can buy litmus papers for water hardness at the pharmacy

My Bosch SRV55 car is narrow, it worked well for more than 7 years, but not often – 1-2r per week. Recently there was a raid on the walls and dishes. I poured salt to the lid. A couple of times at a quick wash — like a raid has passed. One full wash – OK, after 3 days – the second – again raid. The water hardness is set to -3. What is the problem? In your previous answers, you pointed out the flow sensor and the salt sensor. If I added salt, then the salt sensor probably won’t give anything? And how does the flow sensor affect the process?
And another question – if I understand correctly, the ion exchanger is emptied into the sewer before washing, at the beginning and during the washing process it softens running water (gives off sodium), and before the end it is filled with a dose of salt (for hardness) and is restored before the next wash?

Master’s answer: the flow sensor affects the amount of water flowing through the salt container. If it is fast, then little salt is consumed; if it is slow, then more salt is spent. If salt helps, then it’s hardness.

Then I want to clarify – what could happen to the sensor – will ringing with a tester give something? If I open the car on the left and look at the process, can I determine the cause of the malfunction?

The answer of the master: the tester for the sensor will not give anything, you need to “ring it” through the board, and during operation

Where is the flow sensor located? Is it possible to access it without turning the car over? If the water tank on the left wall fills up in 1 minute, is that normal?

Master’s answer: You can get to the sensor itself only from below.

About the flow sensor – this is BOSCH SRV55.
Accidentally discovered – the drain hose does not have a loop – it lies on the floor (max lift -20cm). Could this be the cause of the white patch? After all, on the left wall of the machine in a plastic tank, a knee is formed for a drain half a meter high, or does the hose also need to be lifted and formed _L_ half a meter high and higher?

Master’s answer: the drain must be installed above 50 cm from the floor level.

Dishwasher Bosch skt 3002. There was a plaque on the dishes and walls. It is difficult to rub off, such as scale. Haven’t been before. I use powder finish and salt finish. Where the salt jar is installed there is a regulator 0123. Advise what can be done

Master’s answer: try cleaning the drain filter. The problem may be in it.


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