I have made home-made play dough with hair conditioner and corn starch. It’s super easy but the corn starch can make it pretty messy so I’d suggest making it outside!
Mix in a big bowl 1 cup conditioner (any brand, color, etc. we used scented so it smelled really good!) and 2 cups corn starch. Stir until it becomes crumbly then you’ll have to work it with your hands to squish it together to make it a play dough substance! It ends up being really soft, silky, and smells good! The kids love it!