Now that I have conquered use of my fabulous cup, how should I clean it at the end of my period? I have been washing with water and mild soap each time I empty it but as far as the big monthly clean I am clueless. I don't want to boil it as I have read somewhere here that it can make the silicone softer and my cup is perfect how it is. I was thinking of surgical spirits (rubbing alcohol) or hydrogen peroxide but what method does one use with such things? Also, the vinegar method - how does that work?