Was calling some number today to order a few more nebulizers so that if I go away, I won’t have to keep cleaning/sterilizing (great suggestion obtained from the forum). I happened to ask the question: “Is it all right to microwave nebulizer in steam bags or in baby bottle sterilizer equipment?” The gal replied an emphatic “no”. I was not clever enough to ask why … suppose plastic might melt or give off something toxic?? Person went on to say that they only recommend boiling (for 5 minutes) or soaking in 1part white vinegar to 3 parts water for at least 30 minutes. I wish that I could find the number that I called but anyone may verify by going on internet and calling a number or live chatting with someone from a reputable nebulizer company. Please advise if you get a different response. Hope that this is helpful.