Why do dishes leave white residue after being washed in a dishwasher?

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In the process of daily use of the dishwasher, many users have encountered the problem of white powder or water stains after washing the tableware. This not only affects the appearance of the tableware, but also may cause doubts about the cleaning effect. In fact, such problems are not accidental, and are often closely related to various factors such as detergent dosage, water hardness, equipment maintenance or operation details. This paper will systematically sort out the six common causes of the phenomenon of white tableware, and provide scientific and practical solutions.

(1)、Detergent dosage is too much

1. cause analysis

Dishwasher special detergent if used in excess, the alkaline components may not be completely removed in the rinse cycle. After the remaining detergent dries, it will form a white powdery trace.

2. solution

For areas with soft water quality, the amount of 10-15% can be appropriately reduced. It is recommended to use dishwasher detergent regularly for machine maintenance to remove residues accumulated inside. Use low-foaming detergent in moderation to avoid overdose to reduce the risk of residue.

(2)、Lack of special salt

1. cause analysis

In hard water areas, the role of dishwasher-specific salt is irreplaceable. It is mainly used to regenerate ion exchange resins inside dishwashers. The resin can absorb calcium and magnesium ions in water, but it needs to be periodically regenerated by special salt reduction to maintain the function of softening water quality. If you do not add a special salt for a long time, the resin saturation failure, can not prevent the formation of scale, resulting in white tableware.

2. response plan:

①.Special salt needs to be supplemented every 30-50 cycles of operation. It is recommended to use funnel to assist in addition.

②.On first use or re-activation after a long period of inactivity, a complete cleaning procedure should be run to activate the resin function.

(3)、Insufficient rinsing

1. cause analysis

①. Due to insufficient water or low water pressure in the rinsing stage, the detergent and food residues cannot be completely washed away.

②. When the water hardness is high, the calcium and magnesium ions in the water are easy to combine with the detergent to form insoluble precipitation, which aggravates the residual problem.

2. response Programme

①. Use a special dishwasher rinse, which softens the water and enhances the rinse effect. Increase the number of rinsing times or select an enhanced rinsing mode to extend the rinsing time.

②. Install water softener or add water softener.

(4)、Ion exchanger is blocked

1. cause analysis

The resin in the ion exchanger gradually fails due to long-term use or is blocked by impurities in the water, resulting in its inability to effectively adsorb calcium and magnesium ions in the water. Hard water enters the dishwasher without softening, and calcium and magnesium salts precipitate during high-temperature cleaning, depositing on the tableware and the inner surface of the machine to form white scale residue.

2. response Programme

Immediately check and add special regeneration salt until the salt bin is full to ensure that the resin regeneration recovers the softening ability. If the problem persists, contact the after-sales service to check the ion exchanger. In case of serious blockage, the resin or the entire softening unit may need to be replaced.

3. preventive measures

It should be ensured that the salt bin is prepared with recycled salt, and special dishwashing salt should be used, and salt should not be used instead. Check the salt bin and resin status every six months to prevent blockage.

(5)、The reaction between different materials

1. cause analysis

There are significant differences in the sensitivity of tableware surfaces of different materials to water stains and residues:

①. The hydrophilic nature of the glass surface makes it easier to show traces of water stains.

②. Differences in the microstructure of ceramic glaze facets affect the residue adhesion strength.

③. The chromium oxide layer on the stainless steel surface has a relatively good resistance to chemicals.

2. response Programme

When loading tableware, it is recommended to place according to the material partition, easy to choose the appropriate cleaning procedure. For particularly sensitive crystal glass products, a separate hand wash can be considered. Tableware with slight scratches on the surface is more likely to accumulate residues, so it is recommended to replace old tableware regularly.

(6)、Washing water temperature is too low

1. cause analysis

The normal operation of the dishwasher is highly dependent on high temperature water flow, usually the water temperature needs to exceed 60 ℃. Low temperature into the water, detergent activity decreased, alkaline and calcium and magnesium ions combined, after drying tableware white stains.

2. response methods

①. Increase the inlet water temperature: in order to achieve good dishwashing effect, be sure to ensure that the water supply temperature of the water heater is at least 55 ℃. When the water temperature is not enough, add an independent heating device to increase the temperature in front of the dishwasher.

②. Enable heating function: when washing dishes, the program with heating and flushing or high temperature mode is preferred to raise the water temperature in the cabin to fully activate the detergent and prevent white residue.

Conclusion

White residue on dishware after dishwasher washing is a common but preventable problem, often rooted in negligence in water quality, detergent use, machine maintenance or operating details. By reasonably controlling the amount of detergent, adding special salt regularly, ensuring sufficient rinsing, maintaining the function of ion exchanger, paying attention to the material adaptation of tableware and ensuring sufficient water temperature, users can significantly reduce or even eliminate these white marks and improve the cleaning effect.