And lastly, you guessed it—this treatment worked on old stains as well. Follow the same method, but let the baking soda and vinegar sit a bit longer. You can keep an eye on the stain to watch as it starts to lighten up. Repeat as needed, and if you need a little extra cleaning power, you can gently scrub the stain with a small brush (like a toothbrush or other cleaning brush).
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