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So, first,the good news is this cup is now working perfectly. Trimming the stem solved my irritation problems and I can wear it for my entire period now! YAY!

Bad news is for some reason this month it got really stained. Like, super dark stains around the bottom and stem. I read through the tags, and tried soaking it for 4 days in white vinager and water, and sunning it, no luck. I can't boil it cuz it grosses my family out. Any sugestions? It looks icky and it's bugging me. But I don't want to replace it.
Kai: 2Cupskuradi8 on October 11th, 2013 12:33 pm (UTC)
You're in the US, right? Plain ol' hydrogen peroxide, straight out of the bottle. No diluting necessary. Let your cup soak overnight in a small glass, then rinse it off in the morning. As others have said, silicone can withstand much stronger concentrations of peroxide than what we get in the first aid aisle. And it's not a very stable liquid. Just like soda loses its fizz, the peroxide will have become yucky tasting water by morning so you can't "oversoak" your cup. Cheap, readily available, easy. If you want to dedicate a special glass, then pick one up at a thrift store or yard sale.