Thought you might be interested to hear what happened to my mini meluna (clear with blue glitter). I'd had it for only a year. I only used it for 2 or 3 periods. I used to clean it by tipping boiling water over it, and also by dunking it in a 1:10 bleach:water solution and rinsing (meluna says not to use bleach. I did anyway. If i can't bleach it, I don't want it! Edit: as someone who works in science and Chem, I am suspicious of the claim not to use bleach).
Anyway, it got stained and started to have strange smell. This hasn't happened to any of my other cups (silicone). Not long afterwards it got a strange texture to it, as well. It felt kind of sticky/tacky as if the cup was melting, like the plastic was disintergrating! It was sort of coming off as i rubbed the cup.
I can't've melted it during cleaning because i never actually boiled the cup, I only rinsed/soaked it in boiled water. I don't know how to describe the texture. it was most bizarre. Needless to say, I freaked out and threw it out. I should've taken photos or video to share. it was the strangest texture to it. This has put me off Meluna. I think i'll stick with silicone rather than plastic cups.
Anyone else had this happen? To their meluna or some other cup?
EDIT: Just to clarify, I'm not asking for advice on choosing a new cup, and I'm not asking for advice on cleaning. I'm asking people to share their experiences of cups disintergrating, for whatever reason.