Glad to hear the cruise went well. The crew member could have worded the response better. There is the school of thought that overuse of sanitizers can diminish their effectiveness by causing more resistant strains of bacteria and viruses. Up until recently hand sanitizers were really not effective against norovirus. However a new "synergistically formulated ethanol-based hand sanitizer" appears to be effective for viruses. But in the end, washing with soap and water is the most effective method.