It seems like I keep reinfecting myself with a yeast infection with my diva cup. This has been going on for three or four months and it's driving me crazy. I boiled the cup, which seemed to make no difference. Then I soaked it in vinegar and that seemed to help a little, but I tried the cup again, and again got a mild yeast infection. Now I'm boiling it a second time, but for longer. Is it possible that my cup is ruined? Has anyone else had trouble getting their cup clean after an infection? Are there other ways I can clean the cup that might work better?