Smell

Ive been using the cup for a few cycles now, boiling it after the cycle is over but oh my god the smell. Its horrible. I dont even need to wear it in too long for it to get a slight death smell. I try washing it best i can and when i can so i can try to mask it but it doesnt cut it. Is anyone else dealing with this? I feel disgusting. I know I dont have any infections either.