Soak them in water 3-4 days, then it can be removed with a metal spatula.
Remove the adhesive.
It depends on the type of ceramic adhesive. Many of them can be taken off tile with lacquer thinner on a rag.
Goof off will usually remove most self-adhesive glues.
Goof Off will remove that.
With a screwdriver.
Try acetone.
Yes, 3M adhesive remover will work to remove tape residue on your refrigerator. It is made to remove any kind of adhesive, tape, stickers, etc. on any surface.
dettol works
Lacquer thinner will remove it from most materials.
acetone remover
Not to sure how to remove it but to prevent it add a pinch of dried rice in it
If you let the concrete dry on the ceramic, they have bonded. You can try to chisel it loose.