All areas of the home, including food preparation, service, and storage areas shall be maintained in a state of cleanliness so as not to endanger the children's health. Paper towels, a trash receptacle, soap, and toilet paper shall be placed within reach of a child capable of using the toilet without assistance. Trash, garbage, and wet or soiled diapers shall be disposed of in a clean and sanitary manner. After toileting and diapering, before food preparation and eating, after playing outdoors, after handling animals, and at other times when necessary to prevent the spread of disease, the provider or substitute shall: Wash the provider's or substitute's hands thoroughly with soap and warm running water; and Ensure that a child's hands are washed thoroughly, by the provider or by the child, with soap and warm running water. To assist in preventing the spread of disease, the provider or substitute shall: Promptly change a child's diaper, clothing, and bedding when soiled or wet; Follow diapering procedures designed to prevent the transmission of disease, which are established and supplied by the office; and Maintain the surface used for diapering in a clean and sanitary manner. If used, portable toilets, also known as potty-chairs, shall be: Placed on a nonabsorbent surface or mat; Located away from food preparation, food service, and eating areas; and Cleaned and sanitized after each use in accordance with procedures established by the office. Biocontaminants and biohazards shall be disposed of in a clean and sanitary manner.