When clear plastic starts to yellow, it is typically due to a combination of factors such as exposure to sunlight, age, and the breakdown of the plastic's polymers. Cleaning yellowed clear plastic can help improve its appearance, although it may not be possible to completely restore it to its original clear state. Here are some methods you can try:
Soap and Water: Start by cleaning the plastic with a mixture of mild dish soap and warm water. Gently scrub the surface using a soft cloth or sponge. Rinse thoroughly and dry with a clean, lint-free cloth.
Baking Soda Paste: Create a paste by mixing baking soda with water to form a thick consistency. Apply the paste to the yellowed plastic and gently rub it in a circular motion using a soft cloth. Rinse with water and dry with a clean cloth.
Vinegar Solution: Mix equal parts of white vinegar and water. Moisten a soft cloth with the solution and gently wipe the yellowed plastic. Rinse with water and dry thoroughly.
Hydrogen Peroxide: Apply a small amount of hydrogen peroxide (3%) to a clean cloth and gently rub the yellowed plastic. Allow it to sit for a few minutes, then rinse with water and dry.
Lemon Juice: Squeeze fresh lemon juice onto a clean cloth and rub it onto the yellowed plastic. Let it sit for a few minutes, then rinse with water and dry.
Plastic Cleaner or Polish: There are commercial plastic cleaners or polishes available specifically designed to restore clarity to yellowed plastic. Follow the instructions on the product carefully.
Note: Before using any cleaning method, it's always a good idea to test it on a small, inconspicuous area of the plastic to ensure it doesn't cause any damage or discoloration.
It's important to remember that these cleaning methods may not completely eliminate the yellowing, especially if the plastic has undergone significant degradation. If the yellowing is severe or the plastic is valuable, you may want to consult a professional restorer or consider replacing the plastic item.