Ethan Clarke
White plastic items like computer keyboards, light switches, and PVC pipes often turn yellow due to UV exposure, heat, and oxidation. However, there are several methods to restore these items to their original white colour. One popular method is to use bleach, which, despite being corrosive, can effectively restore white shades to discoloured items. Another well-known method is to use hydrogen peroxide, which can be poured into a container, with the plastic item soaked in the solution and left in sunlight until the stain lifts. Other methods include using lemon juice, baking soda, vinegar, and magic erasers.
Characteristics and Values Table for Whitening Smooth Soft Plastic
| Characteristics | Values |
|---|---|
| Cleaners | Bleach, Baking Soda, Peroxide, White Vinegar, Lemon, Denture-Cleaning Tablets, Rubbing Alcohol, Hand Sanitizer, Magic Eraser |
| Procedure | Soak, Scrub, Rinse, Dry |
| Special Cases | Electrical Components, Electronic Devices, Plastic Containers |
| Notes | Wear gloves and eye protection when using bleach. Do not use bleach on items that will go in a child's mouth. |
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What You'll Learn
Soak in hydrogen peroxide
So, you want to whiten some soft plastic? Well, you've come to the right place. One method to whiten soft plastic is to soak it in hydrogen peroxide. This method is easy and quick, and it can bring back that familiar white colour without too much elbow grease.
To start, grab some 3% hydrogen peroxide—you can find this at Target for $1. You'll also need a container that's big enough to fit the plastic you want to whiten and some water. If you're going to be handling the peroxide, it's recommended to wear gloves, as it can be irritating to the skin. Now, pour the hydrogen peroxide into your container—make sure you have enough to completely cover the plastic item. Then, place your plastic item into the container, ensuring that it's fully submerged. You can weigh it down with a similarly-sized object if needed.
Now for the sun! Place the container with the peroxide and plastic in direct sunlight. The UV rays from the sun, in combination with the hydrogen peroxide, will work to turn your plastic from yellow back to white. The time this process takes can vary from a few hours to a few days, depending on the severity of the yellowing and the weather conditions. If you're in a sunny place, like Singapore, you can just leave the container on a table by the window. Alternatively, you can put the container under a UV lamp. Just be sure to check on the progress regularly.
Once the stain has lifted, remove the plastic from the peroxide and give it a good rinse and dry. And that's it! Your plastic should now be nice and white. If you have any leftover peroxide, you can even use it to feed your garden or pour it into a foot bath (just be sure to dilute it first!).
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Bleach and UV light
To whiten smooth soft plastic using this method, start by cleaning the plastic piece. Then, apply a solution of hydrogen peroxide to the plastic. You can use a paintbrush to apply the peroxide evenly to the yellowed areas, or you may choose to soak the plastic in a container of the solution. It is important to wear gloves to protect your skin from the peroxide.
After applying the peroxide, expose the plastic to UV light. You can use direct sunlight or a UV lamp for this step. If using sunlight, place the plastic outside in a well-ventilated area and turn the pieces regularly to ensure that all sides are exposed to the UV rays. If using a UV lamp, be sure to use eye protection to shield your eyes from the UV light.
The time required for the whitening process will vary depending on the intensity of the UV light source and the severity of the yellowing. In some cases, a few hours of exposure to UV light may be sufficient, while others may require leaving the plastic outside for one or two days.
It is important to note that bleach and UV light may not be suitable for all plastics, especially those that come into contact with children or food. Additionally, the use of heat in conjunction with UV light has been suggested by some sources, but it may not be recommended for thin plastics as it could cause warping. Always test the process on a small area of the plastic first and exercise caution to avoid any damage or discolouration.
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Baking soda and water paste
To make the baking soda and water paste, start by pouring some baking soda into a small cup or container. Next, slowly add water to the baking soda and mix until it forms a thick paste. You can adjust the consistency of the paste by adding more baking soda or water as needed.
Once you have prepared the paste, use a sponge or paper towel to rub it into the plastic surface. Be sure to press hard and move in circular motions to ensure that the paste gets inside the small pores of the plastic. You can also use a clean cloth or sponge to apply the paste to the plastic.
After applying the paste, let it sit on the plastic for a few hours. This will give the baking soda time to work on the stains and discolouration. If the plastic item is small and water-friendly, you can also try soaking it directly in the baking soda and water paste.
Finally, rinse the paste off the plastic with warm water. You can use a hose, faucet, or a wet cloth, depending on the item. Be sure to rinse thoroughly to remove all traces of the paste. Once rinsed, dry the plastic with a clean, dry towel.
This method is a simple and safe way to whiten smooth soft plastic. It may require some elbow grease, but it will effectively remove tough grime and stains, leaving your plastic items looking clean and refreshed.
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Lemon juice
To use lemon juice to whiten soft plastic, start by cutting a lemon in half and rubbing the lemon over the plastic so that the juice covers the stains. You can also sprinkle the lemon with salt before scrubbing, as the abrasive quality of the salt will help remove stains. Make sure to get the lemon juice into any nooks and crannies of the stained plastic.
After covering the stains with lemon juice, place the plastic item in direct sunlight for at least an hour. For more severe stains, you may want to leave the item in the sun for a few hours or even a full day. The sunlight works with the lemon juice to help remove the yellow stains.
Once the item has soaked in the sun for an adequate amount of time, put some dish soap on a brush and scrub the item. Then, simply rinse and dry the plastic.
This method works well for small toys and items but may be ineffective for larger items.
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White vinegar
Let the solution sit on the plastic for about 30 minutes. Then, use a bristle brush to scrub the plastic and remove any remaining grime. Rinse the plastic thoroughly with hot water and dry it with a clean towel.
For heavy staining, you may need to adjust the ratio of vinegar to water. Try using two cups of vinegar to one tablespoon of dish soap, with enough water to allow your plastic item to soak. Soak the plastic in this solution for 15-30 minutes before scrubbing and rinsing.
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Frequently asked questions
There are several methods to whiten smooth soft plastic, including using bleach, hydrogen peroxide, vinegar, lemon juice, baking soda, and rubbing alcohol.
Pour hydrogen peroxide into a container, submerge the plastic, and allow it to soak in sunlight until the stain lifts. Then, rinse and dry the plastic.
Yes, lemon juice can be used to whiten plastic. Cut a lemon in half, sprinkle it with salt, and scrub the stained plastic. Alternatively, soak the plastic in lemon juice for at least an hour in the sun, then brush, rinse, and dry it.
Mix equal parts white vinegar and water in a container, submerge the plastic, and let it soak for a couple of hours. Then, rinse and wash the plastic with soap and water.
