How to Make Yellowed Plastic on Appliances White Again

Over time, white plastic on appliances such as refrigerators, microwaves, or keyboards can turn yellow. This discoloration is often caused by prolonged exposure to sunlight, heat, or oxidation of flame-retardant chemicals in the plastic. Fortunately, there are effective methods to restore yellowed plastic to its original white color using simple materials available at home. Here’s a step-by-step guide to help you rejuvenate your appliances.

Understanding the Cause of Yellowing

Yellowing is primarily due to:

  • Oxidation: Plastic contains flame-retardant chemicals that react with oxygen, causing discoloration.
  • UV Exposure: Sunlight accelerates the degradation of plastic.
  • Heat: High temperatures break down the plastic's molecular structure, leading to yellowing.

The good news is that you can reverse this discoloration in most cases with a few cleaning tricks.

Method 1: Baking Soda Paste

Ingredients:

  • Baking soda
  • Water
  • Soft cloth or sponge

Steps:

  1. Mix the Paste:

    • Combine baking soda and water to form a thick paste.

  2. Apply to Plastic:

    • Spread the paste over the yellowed areas of the appliance. Make sure to cover all discolored spots evenly.

  3. Scrub Gently:

    • Use a soft cloth or sponge to scrub the plastic in circular motions. Avoid using abrasive materials that can scratch the surface.

  4. Let It Sit:

    • Allow the paste to sit on the surface for 15–20 minutes. This helps the baking soda break down stains and oxidation.

  5. Rinse and Dry:

    • Wipe off the paste with a damp cloth and dry the area thoroughly.

Method 2: Hydrogen Peroxide Treatment