I'm one of the bad BO people, sadly
-- when you're one of these, deodorants just make things worse (the whiff of ineffective deodorants being chemically destroyed by overpowering BO is unbearable).
Unless you're like me, then normally, keeping your things clean and washing the sweat and etc out in the public fountains found in the pueblos along the way is enough, and you'll find enough interesting smells along the way that your own will mostly be unnoticed.
Pope Francis says that the pastor should smell like his sheep, and something similar is true of the pilgrim and the Camino !!!
You WILL become accustomed to the ubiquitous odour of people's feet, though ... :arrow: :arrow: :arrow:
The deodorant is up to you, but it's frequent to see people quickly jettisoning theirs after a few days walking. They do nothing to stop the sweating ...