Why does my hair get oily after 1 day？

My hair get oily when I don't shower for a day, I used products that didn't include oil to help but didn't help. The only time when I didn't have oily hair after 24 hours was when I swam alot everyday, its also the reason why I can't have long hair it noticeable my oily hair. How do I fix my oily hair?

#AskLemon8 #hair #routine