We have all seen it, probably too many times: someone gets out of the toilet booth/cubicle and rushing outside, never even glancing towards the sink where he/she are expected to wash their hands like we all should be doing.
First dilemma: should I approach them while still in the bathroom? If so, how?
Second dilemma: suppose I know that person and later meet him/her and expected to shake hands. What can I do? Is there a gentle way to bring the issue up without sounding paternal?
I am aware of this other question: How should I approach a co-worker on matters of personal hygiene?, however it looks like the other question is focusing on bad smell and not discussing the habit of not washing hands, thus I don't think it fits as exact duplicate at its current state.