Alexei Volkov
White plastic is notorious for discolouring and turning yellow over time. This is due to the bromine used in the manufacturing process of old ABS plastics, which eventually makes its way to the surface and causes discolouration. Luckily, there are several methods to restore your white plastic items to their former glory.
Characteristics and Values Table for Whitening Discoloured White Plastic
| Characteristics | Values |
|---|---|
| Cleaning products | Hydrogen peroxide, white vinegar, bleach, baking soda, lemon juice, denture-cleaning tablet, dish soap, salt, rubbing alcohol |
| Tools | Container, sponge, brush, toothbrush, plastic wrap, aluminium foil, UV lamp, gloves, safety goggles, respirator mask |
| Steps | Soak, scrub, rinse, dry, repeat |
| Time | 3-24 hours, sometimes longer |
| Safety | Wear gloves, safety goggles, and a respirator mask when handling bleach. Do not cover the treated area with plastic wrap to avoid streaking |
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What You'll Learn
Using hydrogen peroxide
Hydrogen peroxide is a great way to whiten discoloured white plastic. It is a simple and safe method that can make your plastic look as good as new in no time.
First, you need to gather your materials. You will need a container, hydrogen peroxide, cling wrap, a brush, gloves, and safety goggles. You can purchase 3% hydrogen peroxide from a pharmacy, or online. If you are using cream peroxide, you will need a larger amount, as this type of hydrogen peroxide is intended for bleaching hair.
Next, you will need to prepare the plastic. If you are whitening plastic with crevices, such as a plastic lid, you may want to scrub it with a brush first. If your plastic has printing on it, be aware that using hydrogen peroxide may damage this.
Now, it is time to prepare the whitening solution. Pour the hydrogen peroxide into the container, making sure there is enough to cover the plastic. If you are using cream peroxide, you will need to wrap the coated plastic parts with cling wrap to prevent the solution from drying up too quickly.
Place the plastic into the container, ensuring it is fully submerged. If the plastic is floating, weigh it down with a stainless steel bolt or screw. Place the container in direct sunlight, or alternatively, under a UV lamp. The UV light is essential to the whitening process, as it activates the whitening reaction.
Leave the plastic to soak for 3-4 hours, or longer if it is still yellow. You may need to leave it for a few days, depending on the severity of the discolouration. If you are using cream peroxide, regularly check on the progress and turn the plastic to ensure all sides are exposed to the UV light.
Finally, remove the plastic from the solution and rinse it with clean water. Wash the plastic with soap if you have used it on cookware, toys, or if you are concerned about residual cream. Ensure that no residue remains.
Your plastic should now be beautifully whitened!
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Soaking in white vinegar
Gather the discoloured plastic items you want to treat. Ensure they are made of a type of plastic that is safe to soak and won't be damaged by the vinegar. You can usually determine this by checking for a recycling symbol on the item or looking up the specific type of plastic online.
Get a clean container large enough to submerge the plastic items completely. Glass or plastic containers are usually best. Pour enough white vinegar into the container to cover the items. You may want to start with a diluted solution, mixing one part vinegar to one part water, and adjust as needed. Place the discoloured plastic items into the vinegar solution, ensuring they are fully submerged. Let them soak for several hours, or even overnight, depending on the severity of the discolouration.
After soaking, remove the items from the vinegar solution and rinse them thoroughly with warm water. Use a soft cloth or sponge to gently scrub away any remaining discolouration or residue. If necessary, repeat the soaking process until you achieve the desired level of whitening. Finally, dry the items completely before using them. You can let them air dry or use a soft cloth to speed up the process.
The acetic acid in the vinegar helps to break down stains and discolouration, restoring the plastic's original colour. This method is especially useful for removing yellowing from plastic items that have been exposed to sunlight or heat, as well as stains from food, liquids, or other substances. It is a simple, inexpensive, and relatively safe way to whiten discoloured white plastic.
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Exposing to UV light
Discoloured white plastic can be whitened by exposing it to UV light. This process can be done using sunlight or a UV lamp. When using sunlight, it is important to note that what is required is the UV light, not the heat. The plastic should be exposed to sunlight for at least a day, and the UV rays will work in combination with hydrogen peroxide to restore the plastic to its original colour. It is also important to turn the plastic regularly so that all sides are exposed to the UV light.
If using a UV lamp, it is crucial to wear protective goggles as UV radiation can be harmful to the eyes. Additionally, the area should be well-ventilated to avoid high ozone concentration. The UV lamp can be placed in a jar or plastic box, along with the plastic item and hydrogen peroxide, to allow for even exposure to UV light.
The process of using UV light to whiten discoloured white plastic may take some time, and the duration may vary depending on the severity of the discolouration, the weather conditions, and the location. It is important to monitor the progress and adjust the duration as needed.
It is worth noting that while UV light can be effective in whitening discoloured white plastic, it may not always restore the plastic to its original colour completely. The process may need to be repeated over time as the plastic will continue to age and discolour.
Overall, exposing discoloured white plastic to UV light is a safe and effective method to restore its original colour. By following the necessary precautions and adjusting the duration of exposure as needed, one can effectively whiten discoloured white plastic items.
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Baking soda paste
Baking soda is a great natural, gentle abrasive that can be used to remove light staining from discoloured white plastic. To create a baking soda paste, mix two tablespoons of baking soda with one teaspoon of water in a small cup or container. If the paste is too thick to spread, add a few more drops of water.
Once you have your desired consistency, apply the paste to the stained areas with a soft sponge, pressing hard to get the paste inside the pores of the plastic. Let the paste sit for at least four hours, but preferably eight hours or even a full day. Then, dampen the sponge and gently scrub the plastic. Finally, wash the plastic in hot, soapy water and rinse well.
For items that cannot be scrubbed, such as electronics, you can try spraying the baking soda paste onto the affected areas. You can also try using a combination of baking soda paste and hydrogen peroxide spray to remove tough stains.
It is important to note that this method is most effective for light staining. For heavier stains, you may need to try a stronger solution, such as hydrogen peroxide or bleach.
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Lemon juice
To use lemon juice to whiten plastic, start by cutting a lemon in half and rubbing it onto the discoloured area. Make sure the juice covers the stain completely. You can also squeeze the lemon juice into a container and soak the plastic item in it for at least an hour. If the item is something you can't get wet, like an electronic device, you can instead spray the lemon juice onto the plastic.
Once the stain is covered in juice, place the item outside in direct sunlight for a few hours. The sun will help remove the yellow stains. For extra effectiveness, sprinkle salt onto the lemon before scrubbing. The citric acid in the lemon and the abrasive quality of the salt will work together to remove the stain.
After letting the lemon juice sit in the sun, use a brush or sponge to scrub the plastic. You can also use a magic eraser for items that can't be soaked or scrubbed. Rinse the item with water and dry it with a towel.
Repeat this process as needed until you achieve the desired level of whiteness.
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Frequently asked questions
There are several ways to whiten discoloured white plastic, including:
- Soaking in a mixture of vinegar and water
- Soaking in hydrogen peroxide
- Soaking in bleach
- Using a paste made from baking soda and dish soap
Mix one part white vinegar with one part water in a container. Place your plastic item in the container and let it sit for 2-3 hours. Then, rinse the plastic with soap and water.
Fill a container with hydrogen peroxide and place the plastic item inside. Leave the item in direct sunlight for 3-4 hours, then rinse with clean water.
Mix baking soda and dish soap to form a paste. Moisten the plastic with water and rub the paste onto the plastic in circular motions. Rinse and dry.
