How Do I Get Kids Paint Off A Bedroom Wall?

The best product to use for getting paint off the walls is Eraser Blocks. You can easily get them at your local supermarket. They are just like simple foam blocks, you would have to moist them with water and then use them.

You didn't mention what type of paint this is! If it's a poster paint or a water soluble paint it should come off with minimal staining. I heard that either vinegar mixed with a little baking soda,  helps, but you have to make sure that the reaction is done with the two chemicals is done before you apply it to the wall and the paint. The other thing I heard, was lemon juice.
Make sure you test a small hidden area first though, I would hate you hear that you applied this, and all your paint came off your wall. Hope this helps, good luck.

You could use Nail Polish remover to get it off but it takes a little bit of the original paint off!

Nail polish it works but takes some paint off