With your cloth-covered pointer finger, carefully rub the paste over the crayon marks—and only the crayon marks. Then, with another clean and barely damp cloth, wipe away the residue and watch the ...

A glob of paint just landed on the couch. Hands are dripping wet, the walls are splattered with Jackson Pollock-esque splotches. A brush is going right into the toddler’s mouth. It’s an age-old ...