How to Clean Yellowed Plastic

Why Does Plastic Turn Yellow?

Old computers, game consoles, or plastic gadget turned an ugly yellow or brown? This happens because of a flame retardant called bromine that’s commonly used in plastics.

When exposed to UV light and oxygen over time, it causes that yellow discoloration.

The Popular Cleaning Methods

Try popular methods for restoring yellowed plastic and see which one works best for you.

Method 1: Vinegar Soak

What You Need:

• White vinegar
• Container for soaking
• 10 hours at least

The Process:

1. Submerge the plastic piece completely in white vinegar
2. Let it soak for 10 hours minimum overnight
3. Rinse thoroughly with water
4. Dry completely

Results:

Minimal improvement. The vinegar slightly lightened the yellow tint, but the change was barely noticeable. Not worth the time.

Method 2: Baking Soda Paste

What You Need:

• Baking soda
• Water
• Soft brush or cloth
• 1 hour

The Process:

1. Mix baking soda with water to create a thick paste
2. Apply paste generously to yellowed areas
3. Let sit for 1 hour
4. Scrub gently with a soft brush
5. Rinse and dry

Results:

Very mild improvement. While it’s good for general cleaning, it doesn’t address the deep yellowing caused by bromine oxidation.

Method 3: Citric Acid Solution

What You Need:

• Citric acid powder
• Warm water
• Large container
• 24 hours

The Process:

1. Mix 1 part citric acid with 6 parts warm water
2. Submerge plastic completely
3. Soak for 24 hours
4. Rinse thoroughly
5. Dry completely

Results:

Better than vinegar especially with higher concentration but still minimal improvement. The citric acid isn’t strong enough to reverse the chemical reaction that caused the yellowing.

Method 4: Hydrogen Peroxide Cream + Sunlight

What You Need:

• 40 volume hydrogen peroxide cream (from beauty supply stores)
• Clear plastic wrap
• Sunlight or UV lamp
• 6 hours of sunny weather

The Process:

1. Clean the plastic thoroughly with soap and water
2. Apply a thick layer of hydrogen peroxide cream
3. Wrap tightly with clear plastic wrap
4. Place in direct sunlight or under UV light
5. Check progress every hour
6. Once whiteness is achieved, rinse thoroughly
7. Clean with soap and water

Results:

The best improvement!
This method actually reverses the chemical reaction that caused the yellowing. The plastic returned to nearly its original color.

Safety First

• Work in a well-ventilated area
• Wear gloves when handling hydrogen peroxide cream
• Keep all cleaning solutions away from children and pets
• Test on a small, hidden area first
• Don’t mix cleaning solutions

Extra Tips

1. Clean the plastic thoroughly before treatment
2. More sunlight equals better results with the peroxide method
3. Multiple treatments might be needed for severely yellowed items
4. Don’t expect miracle results from home remedies like vinegar or baking soda
5. The hydrogen peroxide method works better on solid plastics, not painted surfaces

Prevent Yellowing Plastic

To prevent yellowing:

• Store plastic items away from direct sunlight
• Keep in a cool, dry place
• Avoid exposure to heat and humidity
• Consider using UV-protective cases for valuable items

Conclusion

The hydrogen peroxide cream method is the only one that shows significant results. It’s relatively inexpensive, safe when used correctly, and it works. In some countries it might be harder to find the concentrated peroxide cream for hair bleaching. Ask in the supermarket and the dedicated hair salon supplies shops.

Vintage Devices Tips

For valuable vintage electronics or collectibles, consider seeking professional restoration services. Sometimes it’s better to invest in professional care than risk damaging rare items with DIY methods.