Dishwashing Blues

[Ringlet]

Washing the dishes by hand, I managed to get a ceramic cereal bowl stuck fast inside a slightly larger plastic bowl.
I've tried everything to separate them - running hot and cold water, prising with a knife, battering with a wooden spoon, all accompanied by some very persuasive language.
But they refuse to be separated.
Does anyone have any suggestions on what I could do to separate the two bowls? I need both for my cooking.

[calmck]

Have you tried putting liquid soap between them if you can let it flow down

[Maydup]

I thinks its hot water for the bottom one and ice into the upper one. Then twist.

This link might work

[Ringlet]

Many thanks, folks, I still haven't got them unstuck, but will try again tomorrow.
Have a good night.