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.