Cleaning Glass (D730) is a complete practical life work cycle for 3–6 children that covers the full sequence of wetting, wiping, and polishing a glass surface, reinforcing the Montessori principle that care of the environment is purposeful and ordered. The multi-step sequence supports executive function development as children must track and complete each stage in the correct order. This set is especially useful for extending your care-of-environment shelf with a work that produces a visible, satisfying result and holds the attention of children who are ready for longer activity cycles.