Personal etiquette and cleanliness includes hygiene.
Muslims throughout the world have extremely high standards of personal hygiene, because Islam places great emphasis on both physical and spiritual cleanliness and purification. While humankind in general usually considers cleanliness to be a pleasing attribute, Islam insists on it. Muslims are required to take care of their personal hygiene by ensuring that they are well groomed, and that their bodies, clothing and surroundings are clean. Prophet Muhammad (PBUH) informed his companions, and thus all of us, about the importance of cleanliness when he said, “cleanliness is half of faith.” (Saheeh Muslim)
The Quran is more specific and says, “Truly, Allah loves those who turn unto Him in repentance and loves those who purify themselves.” (Quran 2:222)