No, this just makes them look dingy. Don't ask me how I know.
Use some diluted bleach, cold water, and soak for several minutes. The longer you soak, the lighter it gets, so keep an eye on it. Remember it will be darker as it is wet. Let it dry. Check the color. You can also re-soak to get it lighter.
Once it's the right color, wash it with some detergent to get rid of all the bleach.
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