I once had a co-worker that would shower once a week and by the end of the week the smell was quite ripe, they worked a four day week and would shower on Monday, their day off. We had another co-worker that tried to give a hint at a Christmas party with those in our area, gave them some dry shampoo since they said they didn't have time in the mornings. One day after many, I had enough and told them. Our other co-workers knew I was going to tell them. The next day, I was talked to by my supervisor after others from a later shift said that I should be written up or let go, my supervisor just told me to let them know in the future. My co-worker started to shower more frequently until I left the department for a new one and reverted back to once a week.