20 Brilliant Ways to Repurpose Old, Spoiled Milk

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2. Polish jewelry

Did you know that the acidity of spoiled milk that cut through the corrosion on precious metals? The more acidic the milk becomes, the easier it removes rush and blemishes from jewelry. Just drop your rings or necklaces in a cup of sour milk, let them sit for 30 minutes, and rinse with a bit of dish soap. Blot on a dry towel, and your jewelry will end up looking as good as new!

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