Environmental Stewardship Principles Clean for health first and appearance second. Minimize human exposure to contaminants and cleaning products. Recognize cleaning as an environmental health benefit. Commit to occupational development of cleaning personnel. Communicate the value of healthy buildings. Minimize chemical, particle and moisture residue when cleaning. Ensure worker and occupant safety. Contain and reduce all pollutants entering the building. Dispose of cleaning products in environmentally safe ways. Establish and document routine maintenance schedules.