Thick hair doesn't need to be washed as frequently as thin hair does, so you can get away with not shampooing every day. In fact, washing your hair every other day will keep it healthier, since it won't get as dry and prone to breakage. If you have oily skin and hair, you may need to wash your hair every day so it doesn't get greasy. A moisturizing conditioner will help make your thick hair smoother and more manageable. Look for conditioners that say “moisturizing” or “deep conditioning” on the bottle. Condition your hair in the shower right after you shampoo it. Clarifying shampoos are stronger and more deep-cleaning than regular shampoos, and they’re great at washing out hair products that build up on hair, like waxes, creams, and hairsprays. Since thick hair is more prone to buildup, washing your hair with a clarifying shampoo once a week will keep your thick hair soft and clean.  Clarifying shampoos can be harsh on hair, so don’t use one more than once a week. Minimize dryness by using a moisturizing conditioner after you wash with a clarifying shampoo. Part of the challenge of styling thick hair is how much volume it has. That's why air drying is a good idea when you have thick hair — it prevents excess volume. Avoid using a blow dryer or towel to dry your hair or you'll make it more voluminous.

Summary:
Wash your hair every other day. Use a moisturizing conditioner after you shampoo your hair. Wash your hair with a clarifying shampoo once a week. Let your hair air dry when you get out of the shower.