I went through the same thing. I know I got to clean everywhere on the body, but cleaning my belly button never entered my mind for some reason. My belly button started getting dirty around age 14, and a few years later I noticed there was a grey lump inside my belly button, and I kept trying to get it out using Q-tips and soap and soothing cream, but it wouldn't get it out and it felt so uncomfortable poking about in my belly button too, so I just left it. Then, a few months ago, when I finally got asked on a date by the man of my dreams, I decided I just had to sort my belly button out, so I did the best I could and I finally got the grey lump out and got it all cleaned. The grey lump must have been a build-up of whatever got built up in there.
_________________
Female