Appearance of yellow Plaque on the inner walls of the refrigerator compartment is a common problem faced by owners of household appliances. This defect not only spoils the aesthetic appearance of the unit, but may also indicate the accumulation of bacteria or chemical changes in the structure of the material. Most often, shelves, drawers for vegetables and door seals made of ABS plastic are affected.
The occurrence of plaque is caused by the oxidation of fire retardants contained in plastic under the influence of light, heat and contact with fat. Timely cleaning allows you to extend the life of parts and maintain the hygiene of food storage. Ignoring the problem can lead to the appearance of an unpleasant odor, which will be absorbed by fresh food.
Fortunately, you can restore the whiteness of parts yourself, without resorting to the services of service centers. There are proven methods to safely eliminate yellow discoloration using affordable products. It is only important to follow the process technology and not use aggressive chemicals that can damage the structure of the polymer.
Why does the plastic inside the refrigerator turn yellow
The main reason for the change in color of internal elements is a chemical oxidation reaction. Manufacturers add special additives to plastic - fire retardants, which make the material fire resistant. Over time, under the influence of ultraviolet radiation and temperature changes, these substances migrate to the surface and turn yellow. This process is natural for many types of plastics.
The second factor is pollution. Fatty vapors from prepared food, juice from berries and other organic substances settle on the walls. If you do not carry out regular wet cleaning, these contaminants polymerize and eat into the micropores of the material. Porous structure Plastic promotes deep penetration of coloring pigments.
The quality of water and detergents also affects the color. Using chlorine-containing products or hard water with a high iron content can leave a permanent residue. In addition, old models of refrigerators often turn yellow due to the natural aging of the material, especially if the equipment was placed on the sunny side.
⚠️ Attention: If only certain areas near the electronics or motor turn yellow, check the heating temperature of these zones. Local overheating can accelerate the degradation of plastic.
Preparing the refrigerator for cleaning
Before you begin to remove yellowness, you must properly prepare the equipment. The first step should always be to completely unplug the appliance. This is a safety requirement that cannot be ignored, since working with liquids and electrical appliances are incompatible.
Next, you should empty the chambers of all products. It is advisable to defrost if the model is not equipped with a No Frostsystem. Even in refrigerators with automatic defrosting, it is recommended to let the unit stand unplugged for several hours so that the plastic warms up to room temperature - warm materials react better with cleaning agents.
All removable elements - shelves, drawers, egg trays - must be removed. It is more convenient to clean them separately, for example, in a bathtub or large basin. The walls of the chamber are also wiped, removing visible grease and dirt, so that the cleaning composition acts directly on the yellowness, and not on the layer of adhering fat.
☑️ Preparation for cleaning
Using hydrogen peroxide and washing gel
One of the most effective methods, which is often used by equipment repair professionals, is a combination of hydrogen peroxide and gel powder. This method allows you to lighten even old yellow discoloration without damaging the structure of the plastic. Peroxide acts as an oxidizing agent that destroys yellow pigments.
To prepare the mixture, you will need 30-40 ml of hydrogen peroxide (preferably a concentration of 12%, but you can also use pharmaceutical grade 3%, increasing the exposure time) and 70-80 ml of gel powder for washing. The components are mixed until a homogeneous paste is obtained. The resulting mass is applied with a sponge or brush to problem areas.
After application, the composition must be left for 2-3 hours. To prevent the mixture from drying out, the treated parts can be covered with cling film. After time, the plastic is thoroughly washed with plenty of warm water. If the yellowness remains, repeat the procedure.
Safety precautions when working with peroxide
Wear rubber gloves, as concentrated peroxide can cause a chemical burn to the skin. Avoid getting the mixture into your eyes and mucous membranes.
It is important to note that this method works best on smooth surfaces. For embossed plastics or rubber seals, a more thorough rinsing of the product from the pores may be required. Gel base helps the composition to better adhere to vertical surfaces without flowing down.
Cleaning with soda and laundry soap
If you don’t have high concentration peroxide on hand, you can use more affordable means. Baking soda in combination with laundry soap creates an alkaline environment that effectively breaks down grease and brightens the surface. This is a softer, but safer method.
A piece of laundry soap (72%) is rubbed on a fine grater. The resulting shavings are mixed with baking soda in a 1:1 ratio. Add a small amount of warm water to form a paste. The mixture should have the consistency of a thick cream.
The paste is applied to the yellow areas and left for 30-60 minutes. After this, the surface is actively but gently wiped with a soft sponge and washed off with water. To enhance the effect, you can add a few drops of ammonia to the mixture, but in this case you need to work in a well-ventilated area.
Soda acts as a mild abrasive, helping to mechanically remove the top oxidized layer. However, on very old, deep yellow stains, this method can only give a temporary effect. In this case, a more aggressive action or replacement of the part will be required.
Comparison of plastic bleaching methods
The choice of method depends on the degree of contamination, type of plastic and available resources. Each method has its own advantages and disadvantages. Below is a comparative table that will help you decide on the best option for your situation.
| Method | Efficiency | Safety for plastic | Availability |
|---|---|---|---|
| Peroxide + Gel | High | Average | Medium |
| Soda + Soap | Average | High | High |
| Specialty chemistry | Very high | Depends on the composition | Low |
| Melamine sponge | High | Low (abrasive) | Medium |
Specialized sprays for cleaning plastic often contain chlorine or strong solvents. They act quickly, but with frequent use they can make the plastic brittle. Melamine sponges they work like an eraser, erasing the top layer, so they should not be used on glossy surfaces to avoid the appearance of matte spots.
⚠️ Attention: Do not use acetone or gasoline or aggressive solvents. They can melt the plastic or make it sticky, after which it will be impossible to restore the part.
Care of seals and rubber parts
Rubber door seals require a special approach. Unlike hard plastic, rubber is more sensitive to drying out. Aggressive bleaching can lead to loss of elasticity, cracks and, as a result, a violation of the tightness of the refrigerator compartment.
To clean seals, it is best to use a solution of vinegar or citric acid. They not only remove yellow stains and mold, but also disinfect the surface. After cleaning the rubber, it is recommended to wipe it with glycerin or a special rubber conditioner to maintain its softness.
If the yellowness on the rubber is caused by mold, you can carefully treat the folds with a cotton swab dipped in hydrogen peroxide. The main thing is not to rub too hard so as not to damage the structure of the material. Regularly checking the condition of the seal is the key to the long life of the refrigerator.
Prevention of yellowness
So as not to look for ways to bleach plastic in the refrigerator in in the future, you should follow simple operating rules. First of all, monitor the temperature and do not place hot foods inside the chamber. Vapors from hot food settle on the walls the fastest.
Use containers to store foods with strong colors (beets, tomatoes, berries). This will prevent direct contact of dyes with the surface of the shelves. Regular wet cleaning at least once a month will prevent fat from accumulating and oxidizing.
It is also worth paying attention to the location of the refrigerator. If it is placed in direct sunlight, the risk of yellowing increases significantly. In such cases, it is recommended to use curtains or move the equipment to a more shaded place. Ultraviolet is the main enemy of white plastic.
Is it possible to use chlorine-containing products (Whiteness)?
You can use chlorine, but with with great caution and only in strong dilution. Chlorine is effective at bleaching, but it is toxic and can make plastic brittle over time. After treatment with chlorine, it is necessary to rinse the surfaces very carefully so that the remaining substance does not get on the products.
Why do only some areas of plastic turn yellow?
Local yellowness often indicates uneven distribution of heat or light. It may also be the result of contact with certain foods (such as spices or oils) or the use of an inappropriate cleaning product in the past that reacted with the material.
How often should you deep clean your refrigerator?
It is recommended to completely defrost and clean the refrigerator at least once every six months. If there are small children or allergy sufferers in the house, it is better to increase the frequency to once every 3-4 months. This will ensure hygiene and the absence of foreign odors.