You really got me wondering about that. I can't find a definitive answer, but Wikipedia certainly suggests it is: > The terms cleanliness and hygiene are often

You really got me wondering about that. I can't find a definitive answer, but Wikipedia certainly suggests it is: > The terms cleanliness and hygiene are often used interchangeably, which can cause confusion. In general, hygiene refers to practices that prevent spread of disease-causing organisms. Cleaning processes (e.g., handwashing) remove infectious microbes as well as dirt and soil, and are thus often the means to achieve hygiene. > Home hygiene pertains to the hygiene practices that prevent or minimize the spread of disease at home and other everyday settings such as social settings, public transport, the workplace, public places, and more. Hygiene in a variety of settings plays an important role in preventing the spread of infectious diseases. https://en.wikipedia.org/wiki/Hygiene https://en.wikipedia.org/wiki/Hygiene It does seem like hygiene controls are going to be concerned exclusively with infectious disease, while cleanliness is going to prevent broader contamination of anything toxic.