Ok 2X, my hair is always oily and I'm over it...what are some good shampoos to control oil? Any other tips also welcome.

My hair is fine and blonde (naturally), so anytime I skip even one day of shampooing my hair, it looks like a giant greaseball. I have tried putting a little powder in it to absorb the oil, as well as cornstarch (per suggestions from someone that posted in this subreddit). What else can I do to keep it healthy (since they say you shouldn't wash your hair every day) but still look clean?