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I worked the shampoo into a lather on my hands and then just scrub the scalp and roots, then rinse through the rest of the hair. Dont wash the ends. A little conditioner can combat the damage from overwashing too.
This is a good method.
Another one that you could try is what's called a Conditioner Only wash. You get a "low quality" conditioner (Suave, V05, White Rain), slather it on, and let it sit for a few minutes. Rinse. When I did this method I generally used nice cool water for best results. The reason this works is because these conditioners contain some mild surfacants which lift the dirt and oils...just a little slower than straight up shampoo.
If you really don't have time to wet the hair, dip your fingers into cornstarch and rub on your scalp. Brush it through your hair. Baking soda will also suffice. Just make sure not to use a whole lot (1/8 tsp worked well for me when I had hair halfway down my back) and brush really well.
I did a system called "shampoo free" for a year or so - basically you wash your hair with baking soda and condition with vinegar. My hair had never EVER been so healthy/soft/not frizzy (I have "mixed" hair, but it's not typically mixed hair. It's curly and has a tendency to be dry but it's not coarse at all) in my entire life. Basically instead of stripping the oils and artificially replenishing the hair you just strip the dirt and the natural oils stick around. It's really nice.
But recently I cut all my hair off (about 14 inches or so?) and I've found that CO with a shampooing a couple times a month works really well with my gym schedule (and my hair feels/looks great). You just have to expiriment.