If the glue is completely cured and has seeped between the cup and pearl, run the item under hot tap water (around 150F to 175F).
Um. I don’t think that’s just normal hot tap water any more, Sessin.
My home hot water heater (I happen to know this because I just had to
replace it) recommends 120F. I have it set at 125, which is hot
enough to be uncomfortable to my hands (never mind the shower…) if
not mixed with a bit of cold. at 150 to 175, you’re talking scalding
hot, risking significant burns. That may be what you need for this,
but it’s not likely coming straight out of the tap at that temp. The
steam cleaner jet, though…
Peter