Earwax, boogers, toenail fungus — the body can be pretty gross sometimes. Don’t forget to add “belly-button gunk” to that list. And when you see something in there, you probably want to get it out.

Something we all possess but rarely give much thought to is belly buttons. That small indentation on your belly might not be impressive-looking, but it’s a devious area where sweat, dirt, and bacteria ...