This purpose of this guide is to inform robust evaluations of the WHO training package – a package aimed at personnel whose primary role in health-care facilities is environmental cleaning, hereafter referred to as cleaners. The WHO training package – Environmental cleaning and infection prevention and control in health-care facilities in low- and middle-income countries – was designed to improve the competencies of cleaners through a practical, educational approach for adult learners in low- and middle-income countries and comprises two volumes: trainer’s guide and modules and resources (1,2). An associated OpenWHO online course describes the essential preparations for trainers to deliver the WHO training package.