Wash your hair carefully but thoroughly several times a week. Use a top quality shampoo that is formulated for your type of long hair. De-tangle your hair with a comb or brush before shampooing- I personally use the TANGLE TEEZER ( I’m going to do a separate review on this) Apply shampoo massage your scalp and roots then gently finger-comb your hair. Work the shampoo down to the ends. Don't pile your hair on top of your head and scrub this is something I learnt the hard way!
Use a top quality conditioner on your hair you really do get what you pay for. Apply a small amount of conditioner from your shoulders down using conditioner nearer the scalp can weigh your hair down .Pay special attention to your ends, adding extra conditioner and pressing gently into the ends. Rinse hair with warm, then cool water — not hot. Hot water can damage your hair, making it to look frizzy.
Gently squeeze the water from your hair. Place a towel across your shoulders and allow it to absorb some water from your hair. Slowly de-tangle your hair, starting at the ends and working toward your scalp. Be careful not to pull on your hair. Where possible allow your hair to dry naturally but when pressed for time use a heat protection spray then blow dry.
Consider using a leave-in conditioner or detangler. If your long hair is curly or thick, these leave-in styling products can keep hair soft and manageable.
Invest in a top quality hairbrush as already mentioned I use a TANGLE TEEZER it can be used on wet or dry hair and will not damage it. Comb through wet hair from roots to tips, making sure the ends are completely tangle free. Dirty brushes make your hair dirty. Be sure to remove hair that gets stuck in your brush or comb every day. Then wash and dry your brushes and combs once a week. To clean hair brushes and combs, soak in warm water and shampoo for 5 minutes, rinse, and let dry on a towel overnight.
Trim your long hair every 6-8 weeks to remove split ends and excess hair weight that can make hair oily, frizzy, or dry.