Bodies are exhaustingly demanding. The list of things you have to do to stay alive and reasonably healthy gets more detailed the longer you live, especially when it comes to grooming and hygiene. You may think you’re doing a pretty good job of detailing every part of your body, but many people are missing a pretty vital part of their wash: their belly button.
How to Clean Your Belly Button Properly (+ What Happens If You Don't) – A Doctor Explains
Full stop: You need to clean your belly button. If you don't keep it clean, it will remind you of its presence with stench and infections, and you may not be invited to the best cocktail parties.
Whether you have an innie or an outie, soap and water are the basic ingredients for belly button care. Use a mild soap and warm water on your belly button when you shower.
If you have an "outie", it is probably enough to pay attention to the bulge while showering to make sure you have removed any dirt or other things. But if you have an "innie", like most people, showering is not enough.