Friday has certain practices and manners which distinguishes it in comparison to other days:
First: Ghusl (ritual bath) on Friday
It is an obligation and anyone who does not perform ghusl on Friday has committed a sin, unless there is a necessity. Allah’s Messenger (PBUH) said: “Taking a bath on Friday is a must for every adult”. Bukhari (879)
Second: cleaning, putting perfume and oiling the hair
It is an act of Sunnah to clean one’s self as it was revealed in the hadith by the Prophet, Peace Be upon Him, who said: "No man takes a bath on Friday and purifies himself as much as he can, and makes his hair tidy, and puts on perfume, then goes out, and does not come between two people, then prays as Allah decrees for him and listens attentively when the imam speaks, but he will be forgiven for his bad deeds between this Friday and the other." (al-Bukhaari, 833)
Self-cleaning is something additional to ritual bathing, as cleaning eliminates any bad smell and its causes. This is why it is sunnah to shave the pubic hair, pluck the armpits hair, trim the moustache, cutting the nails, oil and comb the hair so that the Muslim looks at his best on Friday.
Third: Wearing the Best of Clothes
The Prophet, Peace Be upon Him, used to wear his best clothes for meeting envoys and on Friday. Abdullah ibn Omar narrated that his father Umar ibn al-Khattab saw a silk robe at the door of the mosque. He said: "O Allah’s Messenger, would you buy this robe and wear it on Friday and when envoys come to you?" The Messenger, Peace Be upon Him, said: "Only a person who has no portion in the next world wears this."
Fourth: The Siwak
Abi Saeed al-Khidri narrated that Prophet Muhammad, Peace Be upon Him, said: "Ghusl and using siwak on Fridays are obligatory for everyone who has reached the age of puberty, and he should put on whatever he can find of perfume." Sahih Muslim (7/846)
If a person uses the toothbrush as well on Friday, it would also be good and praised.
Fifth: Going Early to the Mosque
The Messenger of Allah (Peace Be upon Him) said, "He who takes a bath on Friday, like the bath for ceremonial purity, and then goes (to the mosque), he is like one who offers a camel as a sacrifice to seek the Pleasure of Allah; and he who comes at the second hour is like one who offers a cow to win the Pleasure of Allah; and he who comes at the third hour is like one who offers a ram with horns (in sacrifice); and he who comes at the fourth hour is like one who offers a hen; and he who comes at the fifth hour is like one who offers an egg. And when the Imam ascends the pulpit, the angels (who write the names of those who come to the mosque before the coming of the Imam) close (their record) in order to listen to the Khutbah." (Sahih al-Bukhari, 881)
Sixth: Not to separate between two people
It means not to come between two people sitting close and sit between them. But, if there is some room, this would not be separation because they are sitting apart. Sitting between two people who do not have a room for another person between them is a sort of harm. The Prophet, Peace Be upon Him, saw a man stepping over people's necks to walk and sit between them on Friday while He was giving the sermon, so the Prophet said: “Sit down, you have annoyed (the people).”