Boiling a menstrual cup is a straightforward process. After washing your hands, check the menstrual cup to make sure the air holes at the top are open and not blocked. Then grab a pot that is big enough to contain - and completely submerge - the menstrual cup. Fill the pot with water, then bring it to the boil. Place the cup in the boiling water, making sure it is fully submerged. Then simply let it boil for 3 to 5 minutes, keeping an eye on the cup to make sure it doesn’t burn, and stays beneath the water.