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Curly hair routines are built on leaving things in: leave-in conditioner, cream, gel, oil. They are also built on washing gently. Put those two habits together for long enough and a film accumulates on the hair that a mild shampoo cannot shift. That film is buildup, and it is behind a surprising number of bad hair months.
The signs
- Hair feels coated, waxy or slightly sticky, even when freshly washed.
- Curls are dull, limp and looser than usual.
- Products sit on the surface instead of absorbing.
- Hair takes longer than it used to to get properly wet.
- Your scalp is itchy or flaky.
- A routine that worked for months has stopped working.
That last one is the most telling. When people say their hair has "got used to" a product, buildup is nearly always what has happened.
The three kinds of buildup
Product. Butters, heavy oils, waxes, some polymers in gels, and silicones that do not dissolve in water. The richer your routine, the faster it gathers. See Sulfates and Silicones for which ingredients linger.
Minerals. Hard water is high in calcium and magnesium, which bond to the hair and leave it stiff, dry and rough. If your kettle furs up or your shower glass spots, your water is hard.
Oil and skin. The scalp's own sebum, sweat and dead skin, which gentle co-washing does not fully remove.
How to remove it
Product and oil: clarify
A clarifying shampoo has stronger cleansing agents than an everyday one. Use it on the scalp and the lengths, lather twice if the first lather is weak, and rinse thoroughly.
Minerals: chelate
Ordinary clarifying shampoos do not remove mineral deposits. A chelating shampoo contains ingredients that bind to minerals so they rinse away.
Always follow with conditioner
Hair that has just been clarified is clean in the full sense: nothing on it at all. It will feel rough. Follow immediately with a deep conditioner, which will absorb far better than usual.
Hair does not get used to products. It gets coated in them.
How often
| Your routine | Clarify |
|---|---|
| Light products, regular shampoo | Every six to eight weeks |
| Gels, creams and gentle shampoo | Every three to four weeks |
| Butters, heavy oils or co-washing only | Every two to three weeks |
| Hard water | Chelate once or twice a month |
| Swimming regularly | Chelate weekly during the season |
Treat these as starting points. The real signal is your hair: clarify when the signs above appear.
What about apple cider vinegar?
A diluted vinegar rinse, about one part vinegar to four or five parts water, is a popular home remedy. It is mildly acidic, which helps smooth the cuticle and can loosen light residue. It is not a substitute for a clarifying shampoo when buildup is heavy, and used undiluted it can irritate the scalp. Think of it as an occasional rinse, not a treatment.
Preventing buildup
- Use less. Most people apply two or three times the product they need.
- Apply to wetter hair, so products spread thinly instead of sitting in patches.
- Shampoo your scalp properly. A full minute of massage, every wash.
- Watch the layers. A leave-in, a cream, a gel and an oil every wash day will build up quickly on all but the thickest hair.
- Refresh with water. On non-wash days, re-wet instead of adding more. See The Second-Day Refresh.
If clarifying does not help
If your hair is still dull and limp after a proper reset, buildup was not the cause. Look next at protein and moisture balance, and at whether your products are simply too heavy for your hair.