Walls are something that most people don't bother to clean on a regular basis, but they're actually easy to revive if they get dirty. And a houseful of kids rubbing streaks and planting handprints and ketchup spots all over walls is a good excuse to give your home a good wipe-down.
All-purpose cleaners will work on a normal wall, but if you think you have a non-standard paint type, test a small area with soap and water first. As long as the wall dries normally, you're ready to clean. Give walls a quick dusting from the top down, then wipe from the bottom up to prevent any drippy streaks. And you're done! Time for a smoothie and a nap.