I would say deep cleaning of ears. You can easily get the surface stuff with a Q-tip, but to get deep you need a pick/scoop tool. If you're not used to doing it, it hurts at first because that skin is so sensitive. I neglect to do a deeper clean because I just can't stand that feeling after a while. However, I do go to the doctor and have them scoop it out with their tools that are so much less invasive, and can get it in seconds compared to 10 minutes of trying to get it.
 
My old friend once told me I smelt terrible because I didn't put on enough deodorant and I worked a physically demanding job. Ever since then, I put enough deodorant on to ensure I don't smell around people.
 
I work from home and sometimes I forget to brush my teeth and wash my face. I need to remind myself to brush regularly and wash regularly.
 
I have a friend that hate brushing his teeth before coming to school. I have talked to him, send messages and still he will always leave his teeth like that all time. I don't know if he showers too.

That's a dirty person because I don't understand the reason someone would be behaving in such a manner. It makes absolutely no sense.