At the end of every period, your Ruby Cup should be boiled for five minutes to sterilize. This way you can be sure that it’s clean for your next period. Ruby Sterilizer is great for cleaning between periods – put your cup inside the sterilizer with water and boil in the microwave or oven.
Microwave: boil for 5 minutes at 1000 Watts
Oven: boil at 200° Celcius or 390° Fahrenheit for 10 minutes
After boiling, wait until your cup is cool, dry thoroughly and store in your Ruby bag.
When boiling your Ruby Cup, make sure you don’t overboil it (no more than 15 minutes), otherwise the silicone will lose some of its bounciness and not open up so easily anymore when inserted, hence leading to potential troubles with leaking.
Have a look at Cleaning and Storing Your Menstrual Cup for some cleaning tips.