Personal Hygiene is a must

One of my must-have's in a guy,friend or anyone I am around is personal hygiene.
For me, its a personal thing. I always like feeling fresh and clean and I like people around me to be the same.
At the moment I have had several encounters or should I say have seen several things that have disturbed me and I put the question out there, Should I mind my own buisness or is personal hygiene something in which the average joe can have a say?
Lets start with personal (It has come up several times in this blog already!). That means, you.
What does personal hygiene mean to you. To me it means the following:
-Shower or bath daily
-Wash hands after bathroom visits.
-Blow nose with tissues
and the list can go on. Why do I point out these particular issues one may ask?
Because I have seen all of the following this week and it is really starting to get under my skin.
A lady in my work building is known for her unhygenic ways. To put it bluntly, its disgusting. It has come to the drastic measure where management has put up 'Hygiene signs' in the bathroom and the lady still ignores the sign and continues on her merry way with unwashed hands. People like myself in this building have to touch the same things she does. For example, doors, lift buttons etc so what do you say to one who is most likely to be offended?
The second encounter in which I had seen at lunchtime was a shabbily dreessed man, unshaven, hair messy, beer gut hanging over his trackies picking his nose. Yes in public, out there for everyone to see. To make the matter worse, wiping his findings on a building wall and then starting to rub his crotch and pull his wedgie. It literally made me gag. Even thinking about now, I want to be sick.
There is a line and these people are crossing it.
What to do is the question? Ideas?