Double shampooing, as the name suggests, involves washing hair twice before using other treatments. The first wash removes product buildup, while the second deep cleans and nourishes the strands. To get the best results from double shampooing, use a clarifying shampoo for your first wash. Clarifying shampoos are formulated with degreasing, mineral-removing, and Ph-balancing ingredients. These properties enable them to more effectively break down product buildup on the hair and scalp.

Clarifying shampoos are ideal for restoring volume to flat hair. If you cleanse your hair the right way, you'll be able to feel when it's oil-free and ready for another wash. But, naturally, you need to rinse out the shampoo thoroughly with warm water first. For the second round, you should consider the needs of your skin and scalp. Your scalp has more oil glands than your face, so if your skin is dry, there's a good chance that your scalp is too. In this case, use an anti-breakage or moisturizing shampoo.

However, if your skin and scalp produce enough or even too much oil, you could probably get away with using your clarifying shampoo a second time. Likewise, you could also use a volumizing shampoo for a fuller look. After your second wash, the next step is conditioning which is great for hair texture and volume. Leave your conditioner in for the appropriate time — or longer if it needs some extra TLC — and finally, you're ready for some aftercare.