Don’t rub your braids as you wash them
When you are under the shower, the best thing to do is to wash your hair with a clarifying shampoo to get rid of the dirt and buildup in your scalp. This is the area that is going to be exposed and more prone to build up. Wash your hair from scalp to ends, with the movement going in a vertical angle—this will prevent frizziness at the roots and braids. depending on the type of hair (think human vs. synthetic), a small dollop of conditioner should be used on the ends only.
Immediately after washing, use a hot oil treatment to rehydrate your stressed scalp. Argan oil is a firm favourite due to the molecules being small enough to penetrate the hair shaft rather than sitting on top of your hair as a traditional oil would. Spraying braids daily with a leave-in deep conditioner will also keep your hair hydrated between washes.