If I'm not going anywhere on the weekend, I let my hair 'go.' Same with my face. Not shaving for a few days, is the best remedy for irritated skin. Wait a few days to shave, and your skin feels like silk, afterward.
Otherwise, I have to wash my hair each day. But every night, I give my scalp a massage, for fifteen minutes, or so. A really, vigorous one, bearing down pretty well with my fingertips. Talk about bringing oil, to the surface! You wouldn't believe how much oil oozes from the scalp. Like a natural conditioner. My favorite shampoo is Jean Marc Maniatis bioacide de fruits. It's excellent. Avon's grapefruit/rose is wonderful, too.