After contamination, what is the most practical universal precaution to take?

The most practical universal precaution to take after contamination is soap and water. This is because soap and water are effective in physically removing contaminants, including bacteria and viruses, from the skin. The mechanical action of washing hands with soap and water is crucial, as it disrupts the bond between germs and skin, allowing for thorough cleaning.

While other options, such as hand sanitizer, cleansing wipes, and alcohol solution, may be convenient and effective in certain situations, they do not replace the comprehensive cleaning action provided by soap and water. For instance, hand sanitizers are useful when soap and water are not available but may not be as effective when hands are visibly dirty or greasy. Cleansing wipes can also be helpful, but their efficacy can vary based on the formulation and contact time. Similarly, alcohol solutions are effective against many pathogens but require a certain concentration and sufficient contact time to work effectively. Thus, for a thorough cleansing after potential contamination, soap and water remains the most reliable and practical choice.