How do you know when to stop using your cup? Will it turn yellow, start leaking, or tear or something? Also, how long have your cups lasted for? Has anybody made it to the 10-15 year mark?
I just posted a comment in another post with a note about a friend's mom who has been using the same cup for twenty years (which I think is a stretch and also a rare exception to the normal cup user). I think if you take good care of it, it'll last as long as the silicone can hold itself together. And I've read on here some people that put it in when they're not on their periods and it kind of "bleaches" it back to the original colour and others who soak it in something but I forget what... (that's probably not a lot of help. sorry :)
Hydrogen peroxide. Fill a mug 2/3 with water. Fill the menstrual cup with hydrogen peroxide and slip it into the mug. Let sit over night. I have heard that hydrogen peroxide sterilizes (there is a medical definition for exactly how clean something has to be to be sterilized), but I'm not sure if this is true or if it just kills most of the germs.
Drugstores or grocery stores, in the first-aid aisle I believe. Generally in a dark brown plastic bottle (light causes it to break down), that's around the size of a can of soda.
I've only had my cups for a few months, and so far only the Keeper Mooncup (US) has had any staining, so I've only done the hydrogen peroxide once or twice on that one. I think some people here do it every month though. I'd post a new entry if you want to get more responses and a better idea of what others do.
Lol. That reminds me of a card from this card game I play sometimes (Chez Geek). There is one card called "Bed on Fire" and the little blurb down the bottom says, "Now will you change the sheets?"