"Used properly, [cornmeal or cornstarch] is an inexpensive way to remove oil and grease," says Belkin.
To Use: Pour 1 Tbsp cornmeal or cornstarch into an
empty salt or pepper shaker and sprinkle onto dry hair and scalp until
you’ve used it all. After 10 minutes, use a paddle hairbrush to
completely brush it out. Treatment can be applied every other day.