A new research report released by the Health Care Research Collaborative in the US, has pointed out the need for studies to determine the impact of green cleaning programmes on health outcomes in patients and staff. It has called for additional studies to determine the impact of green cleaners on environmental cleanliness and hospital-acquired infection transmission. The research found that variations exist in green cleaning practices across different facilities. The selection of cleaning products that contain or use less harsh chemicals is the most commonly adopted method. Hospitals in their efforts to implement green cleaning programmes do not have the research available to them to determine the best cleaners for their programmes, nor have sufficient guidance to determine which of the green cleaners are proven to be most effective.