You should be retracting your foreskin and cleaning around your penis daily or more as needed. I presume in your almost 24 years you've gotten an erection, which will anatomically retract the foreskin back exposing the head. I just cannot believe you've never wiped yourself there before? I realize the female commentators are trying to address the issue as delicately as possible from there perspective. As a male nurse I've had more experience. It is doubtful you'll get penile cancer from an unclean penis. Its doubtful you'll have many partners if you don't take care of yourself. Google it, check out YouTube, go the library. Many resources available at your finger tips. Good luck, stay clean.