To maintain field washing devices, what must be present at all times?

To maintain field washing devices effectively, having soap present at all times is crucial because it plays a vital role in removing dirt, grease, and pathogens from surfaces and skin. Soap works by breaking down oils and suspending dirt and microbes, making it easier to rinse them away with water. This is essential for ensuring proper hygiene, especially in field settings where sanitation can significantly impact health.

While disinfectants, rags, and bleach may contribute to cleanliness and sanitation, they do not replace the primary role that soap serves in physically cleaning surfaces. Disinfectants are used after cleaning with soap to kill remaining germs, but they are not effective on dirty surfaces. Rags can assist in the process, but they are not a cleaning agent on their own. Bleach can sanitize surfaces but also requires a clean surface to be effective and is not suitable for all materials or situations. Thus, soap is the fundamental component needed to maintain hygiene in field washing devices at all times.