Why curly hair needs a different cleanser
Sebum travels down a straight strand easily and reaches the ends. On a coiled strand it does not — it gets caught at every bend. That is the whole reason curly hair tends to be greasy at the scalp and dry at the ends simultaneously, and why a cleanser designed for straight hair takes away moisture curls cannot spare.
A gentler surfactant system cleans the scalp adequately while leaving more of the natural lipid on the lengths. That is the entire case for sulfate-free shampoo on curls, and it is a good one — see the sulfate-free guide for where it stops applying.
Should you co-wash?
Co-washing means using a cleansing conditioner instead of shampoo. It cleans with conditioning agents rather than surfactants, so it removes very little oil.
It suits tight coils, very dry hair, and anyone whose scalp is not oily. For a lot of type 4 routines it genuinely replaces shampoo most of the time.
It does not suit anyone with an oily scalp, anyone who uses silicone products, or anyone who styles with heavy gels and butters. Co-wash cannot remove silicone or heavy film-formers, and the result after a few weeks is a coated, unresponsive strand.
The honest middle path, and what we would recommend to most people: co-wash or gentle shampoo most of the time, a proper clarifying wash every three or four weeks.
You still need to clarify — this is the mistake
The single most common failure in a curly routine is buildup. Gentle cleansers leave residue behind by design. Stack a leave-in, a cream and a gel on top of that four times a week and within two months the strand is coated in polymer and oil.
Hair goes limp, definition disappears, products stop working, and the natural reaction is to buy more product — which makes it worse. One clarifying wash resets it, and the difference is often dramatic. See the clarifying shortlist.
How often to wash curly hair
Less often than straight hair, and the AAD's guidance is to shampoo when needed rather than to a schedule — for dry, textured, curly or thick hair, it suggests as little as once every two to three weeks as needed (AAD, everyday hair care).
In practice most curly routines land on once or twice a week with refreshes in between. What matters more than the number is the technique: shampoo the scalp, let the runoff clean the lengths, and never pile curls on top of your head and scrub, which is how tangles and mechanical damage happen.
We have not used these products ourselves. They are chosen from what is in the formula, what those ingredients are documented to do, and whether that matches the problem this page is about — and every product below links to the manufacturer's own page so you can check the formulation claims yourself. The full method is here.
How we picked
Products we have personally tested: none
Most hair care roundups are written in a "we tested these" voice. We have not, and saying so is the point. These picks are chosen the way an informed shopper would choose them: read what is actually in the formula, check what those ingredients are documented to do, match that against the specific problem the page is about, and confirm the product is still being sold.
Each pick gets a role — the drugstore option, the one for high porosity, the gentlest of the set — rather than a score out of ten, because a score would imply a measurement nobody took. Nobody pays for inclusion or placement, and when the cheap product is the right answer we say that too. The full method is on one page.