Solid shampoo, conditioner and body bars: a real-world guide

How solid shampoo actually works

Solid shampoos are conventional surfactants concentrated into a bar by removing water. The main surfactant categories:

• SCS/SCI-based bars (Sodium Coco Sulfate, Sodium Cocoyl Isethionate): most common; strong lather; may be drying on curly or fine hair.
• Syndet bars (synthetic detergent) like Ethique: gentler, closer to pH-neutral, work for most hair types.
• True soap bars: high pH (~9–10), which roughens hair cuticles. Skip for hair, fine for body.

If a "shampoo bar" contains only saponified oils (olive oil, coconut oil, lye), it's a soap bar — use on skin, not hair.

The transition period

Switching from bottled shampoo, hair often feels waxy or heavy for 3–4 washes. This is real — you're stripping accumulated silicones from the previous product, not from the new bar. An apple cider vinegar rinse (1 tbsp in 500ml water) once a week accelerates the transition.

If, after 6 washes with a well-matched bar, hair still feels wrong, the bar isn't right for you. Try a different surfactant base.

Matching bar to hair type

| Hair type | Recommended bar | |---|---| | Fine, oily | Syndet bar (Ethique St Clements, Beauty & the Bees) | | Thick, dry | Solid conditioner bar in addition (Ethique Wonderbar) | | Curly / coily | SLS-free syndet, no coconut oil (Basin, Ethique Frizz Wrangler) | | Colour-treated | Sulfate-free formulas (Ethique Heali Kiwi) | | Sensitive scalp | Fragrance-free bars (Ethique Sensitivity Solid, Nature Direct) |

Solid conditioner

Conditioner bars work by depositing a thin layer of cationic surfactants (BTMS-50 is common). Rub the bar on wet hair mid-length to ends, comb through, rinse.

Solid conditioner is where most first-time users find the biggest gap vs bottled — hair may feel less "slippy". Sit with it for 2 weeks before judging.

Body bars

Body bars are the easiest swap: any decent soap or syndet bar replaces bottled body wash 1:1. Key criteria: - Contains glycerin (locked in during small-batch cold process; often removed in mass-market soap). - No fragrance if you have sensitive skin. - Palm-oil-free or RSPO certified if palm is a concern.

Storage — the make-or-break

A soap bar left in a soap dish full of water breaks down twice as fast as one on a draining rack or hemp saver bag. Aim for: - Draining ceramic or bamboo dish - Or a soap saver bag (also lets you use the ends) - Away from direct shower spray

A well-stored bar lasts 3–6 weeks of daily use — comparable to a 500ml bottle of bottled shampoo.

Travel

Bars are the best travel companion in beauty — no liquid limits, no leaks, no pump. Bring a small tin or a silicone travel pot.

Our picks

• Everyday shampoo: Ethique Solid Shampoo Bar.
• Solid conditioner: Ethique Wonderbar.
• Body: any Australian-made cold-process bar (Beauty and the Bees, Corrynne's).