Using this child car seat belt cover is easy. Just attach it to the car seat belt and adjust it to fit your child comfortably. Make sure the side pillow and shoulder guard are in the right position to provide maximum support. As for maintenance, you can gently hand - wash it with mild detergent and let it air - dry. Be careful not to use bleach or harsh chemicals as they may damage the material. Also, check the cover regularly for any signs of wear and tear. If there are any issues, replace it promptly to ensure your child's safety.