Ceramic Bowl Stuck In Another Bowl

Put a little oil around the rim of the inner bowl.
Ceramic bowl stuck in another bowl. I have tried everything to get them apart. A plate may become stuck in a ceramic bowl because of the way you stored it in your cupboard or because someone accidentally stacked it that way when clearing the table. Smaller ceramic bowl got stuck inside of a bigger ceramic bowl. These bowls have been stuck like this for four months.
How do you get two ceramic bowls that are stuck together separated. Use hot and cold method to separate two bowls. Use ice cubes on top and warm water under bowls to separate. Hot water on the bottom ice on the top one toothpicks.
Put cold water inside the smaller bowl up to about 1 4 inch below the rim. A couple weeks ago i was stacking dirty dishes and two of my pyrex bowls got stuck in each other. The bowl is glass and the plate is porcelain. Another suggestion involved dipping the bottom bowl in hot water and putting ice in the top bowl no luck.
Water can go in and out from the opening but its too small to put something into it to pry the plate out. One suggestion was to spray pam around the rim of the bottom bowl no luck. The best way to separate ceramic bowls that are stuck together is to submerge them in hot water. The video displays it vividly.
The side of the bowl is straight up 90degree there is a little opening on the edge. It s stuck pretty good. Put the stuck bowls inside the freezer for about 2 hrs. Plate stuck inside a bowl.
Often the tool chips scratches or breaks the bowl or plate while you are using it in an attempt to separate the dishes. It takes few secon. You can add dish washing liquid to the water to create some slippery substance to coat the surface.