This is a short video showing what happens when you pour liquid nitrogen into a dirty container. I'm not a scientist so I can't give a scientific explanation of what's happening, but as best as I can tell it make the dirt go move. And move away. With bubbly.
Keep going for the full video. After watching it I decided to throw out all my soap and sponges and invest entirely in giant jugs of liquid nitrogen. Now everything I own is sparkling clean and also shattered.