Am I using the diva cup wrong?

Ok first off I have a super sensitive pH. And i get a yeast infection after literally every period. I wanted to try the diva cup but it seemed that I could never get it clean enough? I would always get an infection. I boiled it every month and rinsed it every time i put it in. I miss the convenience of having it. My doctor said it could've been the blood just chilling in there too long but i only had it in for maybe 8 hours max. I loved it mostly bc i didnt wake up with blood up my buttcrack every morning (tmi sorry). Anyways how do you girls clean yours and do you have any problems? Any advice? Could the infections not be related to the diva cup since im still having them and not using the cup?