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How to get sweat stains out of bras
Find a bucket or basin to wash your bras in.
Fill the bucket or basin with cold water and laundry detergent. Add a bit of 3% hydrogen peroxide to the bucket and mix thoroughly.
This method works well if you have larger stains, as you will soak the entire bra. It would be ideal for sports bras which can get soaked in sweat while exercising.