Is your wallpaper looking a bit dingy? Brighten it up by wiping it with a rag or sponge moistened in a solution of 2 tablespoons baking soda in 1 quart (1 liter) water. To remove grease stains from wallpaper, make a paste of 1 table-spoon baking soda and 1 teaspoon water. Rub it on the stain, let it set for 5-10 minutes, then rub off with a damp sponge.
Most kids have a hard time understanding how easily the dirt on their hands can be transferred to walls. But you can remove most dirty or greasy fingerprints from painted walls by rubbing the area with a slice of white bread. Bread does a good job cleaning nonwashable wallpaper as well. Just cut off the crusts first to minimize the chance of scratching the paper.
Your toddler just created a work of crayon art on paper. Unfortunately, it’s on the wallpaper. Use a bit of steel wool soap pad to just skim the surface, making strokes in one direction instead of scrubbing in a circle, and your wall will be a fresh “canvas” in no time.