I'm not sure about using the baby bottle sterilizer with the Acapella. It is different plastic than the Aerobika, which can be cleaned with baby bottle sterilizer. It may be fine-companies recommend only what they have tested. I tried Acapella for about 6 weeks (worked great, but little part broke) and didn't have Bololo then, but their website says don't use dishwasher. I'd test an old one in your bottle sterilizer. When I used it, I put it in alcohol kept in Costco sized jam jar. (I'm retired nurse and peroxide was frowned upon for cleaning when I worked-find I'm still biased.) I did take a look at National Jewish and they say both are ok.
Here's link. https://www.nationaljewish.org/NJH/media/pdf/1-Ed-Chan.pdf