How to whiten yellowed plastic on appliances

Is the once bright white plastic on your appliances looking dingy and yellowed? If so, you’re not alone. Discoloured plastic is a common problem that many homeowners face, especially on older appliances. While it may seem like an unavoidable issue, there are several effective methods you can use to restore the original lustre and whiteness of your plastic appliance components.

In this comprehensive guide, we’ll explore the various causes of yellowed plastic, as well as provide step-by-step instructions for using popular whitening techniques. Whether you’re dealing with a yellowed refrigerator door, stained microwave trim, or dingy control panels, you’ll learn how to make your plastic surfaces look new again. We’ll also share some tips for preventing future discolouration, so you can keep your appliances looking their best for years to come.

whiten yellowed plastic on appliances

So, if you’re ready to bid farewell to that unsightly yellow hue and reclaim the pristine appearance of your home appliances, let’s dive in!

What Causes Plastic to Turn Yellow?

Before we discuss how to whiten yellowed plastic, it’s important to understand what causes this discolouration in the first place. Several factors can contribute to plastic turning yellow over time:

  1. Ultraviolet (UV) light exposure: One of the primary culprits behind yellowed plastic is exposure to ultraviolet (UV) light. This type of radiation, which is present in both natural sunlight and certain types of indoor lighting, can cause the plastic’s molecular structure to break down and discolour.
  2. Thermal stress: Prolonged exposure to heat, such as that generated by an oven or other heating appliances, can also cause the plastic to yellow and degrade over time.
  3. Chemical reactions: Certain chemicals, including household cleaners, can interact with the plastic and trigger discolouration. This is particularly common on appliances that are frequently cleaned or exposed to these types of products.
  4. Age and wear: Even without direct exposure to UV light, heat, or harsh chemicals, plastic can naturally yellow and become discoloured as it ages and the material breaks down. This is a common issue with older appliances that have been in use for many years.
  5. Smoking and air pollution: Finally, exposure to cigarette smoke, as well as airborne pollutants and particulates, can also contribute to the yellowing of plastic surfaces over time.

Understanding these causes is the first step in tackling the problem of discoloured plastic on your appliances. With this knowledge, you can then determine the best whitening method to address the specific issues your appliances are facing.

How to Whiten Yellowed Plastic on Appliances

Now that we’ve explored the reasons behind plastic discolouration, let’s dive into the various techniques you can use to restore the original whiteness of your appliances. Here are some of the most effective methods:

1. Baking Soda and Lemon Juice

One of the most accessible and budget-friendly ways to whiten yellowed plastic is by using a simple mixture of baking soda and lemon juice. This natural cleaning solution works by harnessing the gentle abrasive properties of baking soda and the bleaching power of lemon juice.

Here’s how to use this method:

  1. Mix 1 tablespoon of baking soda and 1 tablespoon of lemon juice to create a thick paste.
  2. Apply the paste to the discoloured plastic surface using a soft cloth or sponge, making sure to cover the entire area.
  3. Let the paste sit for 5-10 minutes, allowing it to work its magic.
  4. Rinse the area thoroughly with clean water, then dry the surface with a clean, dry cloth.

The baking soda will help to gently scrub away any built-up grime or stains, while the lemon juice will help to lift and neutralize the yellow discolouration. Repeat this process as needed until the desired level of whiteness is achieved.

2. Hydrogen Peroxide and Baking Soda

Another effective whitening solution involves the use of hydrogen peroxide and baking soda. Hydrogen peroxide is a powerful oxidizing agent that can break down the bonds in discoloured plastic, effectively restoring its original colour.

Here’s the step-by-step process:

  1. Mix 1 part hydrogen peroxide (3% solution) and 2 parts baking soda to create a paste.
  2. Apply the paste to the yellowed plastic surface, making sure to cover the entire area.
  3. Let the paste sit for 15-20 minutes, allowing the hydrogen peroxide and baking soda to work their magic.
  4. Rinse the area thoroughly with clean water, then dry the surface with a clean, dry cloth.

This method is particularly effective for removing stubborn yellow stains and discolouration. Be sure to use caution when handling hydrogen peroxide, as it can be a strong irritant if not used properly.

3. Melamine Foam (Magic Eraser)

Another popular whitening technique involves the use of melamine foam, commonly known as a “Magic Eraser.” These abrasive cleaning pads are highly effective at removing a variety of stains and discolouration from plastic surfaces.

Here’s how to use a melamine foam eraser:

  1. Dampen the melamine foam with water and gently rub it over the yellowed plastic surface.
  2. Apply light to moderate pressure as you scrub, taking care not to scratch or damage the plastic.
  3. Rinse the area with clean water and dry it with a clean, dry cloth.

The melamine foam works by breaking down the discoloured plastic molecules, revealing the original white surface underneath. This method is particularly useful for tackling tough, ingrained stains and discolouration.

4. Bleach Solution

For more stubborn cases of yellowed plastic, a diluted bleach solution can be an effective whitening agent. However, it’s important to use caution when working with bleach, as it can be a harsh and potentially damaging chemical.

Here’s how to use a bleach solution:

  1. Mix 1 part bleach with 10 parts water to create a diluted solution.
  2. Using a soft cloth or sponge, apply the bleach solution to the discoloured plastic surface.
  3. Let the solution sit for 5-10 minutes, then rinse the area thoroughly with clean water.
  4. Dry the surface with a clean, dry cloth.

Be sure to test the bleach solution on a small, inconspicuous area first to ensure it doesn’t damage the plastic. Additionally, work in a well-ventilated area and wear gloves to protect your hands.

5. Commercial Plastic Whitening Products

If you’d prefer a more specialized solution, there are a variety of commercial plastic whitening products available on the market. These products are specifically formulated to address discolouration and yellowing on plastic surfaces, often incorporating powerful yet gentle cleaning agents.

Some popular commercial plastic whitening products include:

Weiman Plastic Cleaner & Polish– Formulated with a blend of natural oils
– Helps protect against future discolouration
– Suitable for both matte and glossy finishes
Therapy Premium Plastic Cleaner– Powerful yet gentle cleaning formula
– Restores the original lustre of plastic
– Safe for a wide range of plastic appliances
Zep Plastic Polish & Restorer– Removes scratches and dull spots
– Leaves a long-lasting, high-gloss finish
– Contains UV blockers to prevent future yellowing
Bar Keepers Friend Plastic Cleaner– Powerful yet gentle cleaning formula
– Restores the original luster of plastic
– Safe for a wide range of plastic appliances

When using these products, be sure to follow the manufacturer’s instructions carefully, as they may have specific application and safety guidelines.

Preventing Future Discoloration

In addition to restoring the whiteness of your yellowed plastic appliances, it’s also important to take steps to prevent future discolouration. Here are some tips to help keep your plastic surfaces looking their best:

  1. Limit UV light exposure: When possible, minimize the amount of direct sunlight or other UV light that reaches your appliances. This can be achieved by closing curtains or blinds or positioning the appliances away from windows.
  2. Avoid excessive heat: Keep your appliances away from heat sources, such as ovens, stoves, and direct sunlight, to prevent thermal stress and discolouration.
  3. Use gentle cleaning products: Opt for mild, non-abrasive cleaners when maintaining your appliances. Harsh chemicals and abrasive scrubbing can accelerate the breakdown and yellowing of plastic.
  4. Regularly clean and maintain: Make a habit of regularly cleaning your appliances, wiping down surfaces with a damp cloth and mild soap or a dedicated plastic cleaner. This can help prevent the buildup of grime and stains that can contribute to discolouration.
  5. Consider protective coatings: In some cases, applying a clear, protective coating to the plastic surfaces of your appliances can help shield them from the elements and prevent future yellowing. Some popular options include:
  • PlastX Clear Plastic Polish & Protectant: Helps protect against UV damage and scratches.
  • Invisible Glass Plastic Cleaner & Protectant: Leaves a long-lasting, non-greasy protective coating.
  • 3M Plastic Restorer & Protectant: Restores and protects against future discolouration.

By following these preventative measures, you can help keep your appliances looking their best for years to come.


Dealing with yellowed plastic on your home appliances can be a frustrating and unsightly issue, but it can be easily remedied with the right techniques and products. From natural solutions like baking soda and lemon juice to more specialized commercial cleaners, there are numerous effective ways to restore the original whiteness of your plastic surfaces.

By understanding the common causes of discolouration and applying the appropriate whitening methods, you can revive the appearance of your appliances and maintain their pristine condition for the long term. Remember to also take proactive steps to prevent future yellowing, such as limiting UV light exposure and using gentle cleaning products.

With the tips and techniques outlined in this comprehensive guide, you’ll be well on your way to reclaiming the sparkling white finish of your home appliances, transforming them from dull and dingy to bright and beautiful once again.

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As the founder of Clean It Spotless, I am Melissa Walker, a leading expert in removing tough stains from fabrics, carpets, and upholstery. With over 10 years of experience in the cleaning industry, I have developed my own natural, non-toxic stain-fighting formulas that lift stains while preserving the integrity of the underlying material. My stain removal tutorials are widely read online, and I have appeared on local TV segments demonstrating my techniques. I also present popular stain removal workshops at community centers and schools.