Strategy: show kids how to help
Give your children specific instructions: Just saying "Clean your room" is too vague for most of them, and it's also overwhelming. "Pick up all the blocks and put them in the block box" is a more useful thing to say. Break big jobs down into smaller ones.
Make sure there's enough storage space: If you're helping your child clean his room and get stuck trying to find a place for everything, you need to get rid of some stuff or get more storage, or both.
Maximize closet space by hanging shoe racks on the doors (which you can use for more than just shoes!). Add hooks for hats, belts, necklaces, tote bags, robes, and so on. If hangers and drawers are out of reach, keep a library stool in the room so kids can reach clothes, to make it easier for them to clean up or get dressed.
Photo by Abigail Batchelder (CC Licensed)