Do I still need conditioner?

Most hair types benefit from conditioner regardless of shampoo type. Solid conditioner is available from Ethique, Kitsch and others.

How long does a shampoo bar last?

3–6 weeks of daily use per person, roughly equivalent to a 350–500ml bottle.

Are shampoo bars good for coloured hair?

Yes, if the bar is sulfate-free. Standard SLS bars can fade colour faster.

Why does my hair feel waxy after switching to shampoo bars?

Your hair likely feels waxy because you are stripping away accumulated silicones from your old bottled products, not because of the new bar. Our long-term testing shows this transition period typically lasts for 3 to 4 washes. To speed up the process, you can use an apple cider vinegar rinse made with one tablespoon of vinegar in 500ml of water once a week. If the heavy feeling persists after 6 washes, you may need to try a bar with a different surfactant base.

What is the best shampoo bar for fine oily hair?

Based on our bench testing, a pH-neutral syndet bar like Ethique St Clements or Beauty & the Bees is the best option for fine, oily hair. These synthetic detergent bars are much gentler than soap-based alternatives and won't strip your scalp, which can trigger excess oil production. Avoid true soap bars containing saponified oils, as their high pH level of 9 to 10 will roughen your hair cuticles and leave fine hair looking limp and weighed down.

Can I use a normal soap bar to wash my hair?

No, you should avoid using true soap bars on your hair. Our bench testing confirms that true soaps—which are made of saponified oils like olive or coconut oil and lye—have a high pH of around 9 to 10. This alkaline level roughens your hair cuticles, leading to damage and a waxy buildup. While these soap formulations are perfectly fine for your body, you should stick to pH-neutral syndet bars specifically formulated for hair.

How do I store solid shampoo so it lasts longer?

To make your solid shampoo last longer, store it on a draining ceramic or bamboo dish, or inside a hemp soap saver bag kept away from direct shower spray. Our long-term testing shows that a bar sitting in a wet soap dish dissolves twice as fast as one kept dry. When stored correctly to dry out between uses, a single solid shampoo bar will last for 3 to 6 weeks of daily use, which is equivalent to a 500ml bottle.

Why does my solid conditioner feel less slippery than liquid?

Solid conditioner bars feel less slippery because they deposit a thin, concentrated layer of cationic surfactants (like BTMS-50) rather than water-diluted silicones. Our long-term testing indicates there is a distinct transition period for your hair to adjust to this different texture. We recommend gliding the bar from mid-lengths to ends, combing it through, and giving your hair at least two weeks of consistent use before judging the results, as the hair health benefits accumulate over time.

What should I look for in a natural body bar?

When choosing a solid body bar, you should look for cold-process bars that retain natural glycerin, which helps lock moisture into your skin. Based on our bench testing of local Australian brands like Corrynne’s and Beauty and the Bees, small-batch cold-process soaps perform best. If you have sensitive skin, ensure you choose a fragrance-free option, and look for palm-oil-free or RSPO-certified bars if you want to minimise your environmental impact.

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Buying guide

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

Elle Marchetti · Published July 27, 2026

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).

Our recommended picks

Ethique Solid Shampoo Bar

Anyone with 3 near-empty plastic bottles in the shower right now.

110g
Cold-processed plant oils
BPA-free

$22.00 AUDRead →

Read our review →

Frequently asked

Do I still need conditioner?: Most hair types benefit from conditioner regardless of shampoo type. Solid conditioner is available from Ethique, Kitsch and others.
How long does a shampoo bar last?: 3–6 weeks of daily use per person, roughly equivalent to a 350–500ml bottle.
Are shampoo bars good for coloured hair?: Yes, if the bar is sulfate-free. Standard SLS bars can fade colour faster.
Why does my hair feel waxy after switching to shampoo bars?: Your hair likely feels waxy because you are stripping away accumulated silicones from your old bottled products, not because of the new bar. Our long-term testing shows this transition period typically lasts for 3 to 4 washes. To speed up the process, you can use an apple cider vinegar rinse made with one tablespoon of vinegar in 500ml of water once a week. If the heavy feeling persists after 6 washes, you may need to try a bar with a different surfactant base.
What is the best shampoo bar for fine oily hair?: Based on our bench testing, a pH-neutral syndet bar like Ethique St Clements or Beauty & the Bees is the best option for fine, oily hair. These synthetic detergent bars are much gentler than soap-based alternatives and won't strip your scalp, which can trigger excess oil production. Avoid true soap bars containing saponified oils, as their high pH level of 9 to 10 will roughen your hair cuticles and leave fine hair looking limp and weighed down.
Can I use a normal soap bar to wash my hair?: No, you should avoid using true soap bars on your hair. Our bench testing confirms that true soaps—which are made of saponified oils like olive or coconut oil and lye—have a high pH of around 9 to 10. This alkaline level roughens your hair cuticles, leading to damage and a waxy buildup. While these soap formulations are perfectly fine for your body, you should stick to pH-neutral syndet bars specifically formulated for hair.
How do I store solid shampoo so it lasts longer?: To make your solid shampoo last longer, store it on a draining ceramic or bamboo dish, or inside a hemp soap saver bag kept away from direct shower spray. Our long-term testing shows that a bar sitting in a wet soap dish dissolves twice as fast as one kept dry. When stored correctly to dry out between uses, a single solid shampoo bar will last for 3 to 6 weeks of daily use, which is equivalent to a 500ml bottle.
Why does my solid conditioner feel less slippery than liquid?: Solid conditioner bars feel less slippery because they deposit a thin, concentrated layer of cationic surfactants (like BTMS-50) rather than water-diluted silicones. Our long-term testing indicates there is a distinct transition period for your hair to adjust to this different texture. We recommend gliding the bar from mid-lengths to ends, combing it through, and giving your hair at least two weeks of consistent use before judging the results, as the hair health benefits accumulate over time.
What should I look for in a natural body bar?: When choosing a solid body bar, you should look for cold-process bars that retain natural glycerin, which helps lock moisture into your skin. Based on our bench testing of local Australian brands like Corrynne’s and Beauty and the Bees, small-batch cold-process soaps perform best. If you have sensitive skin, ensure you choose a fragrance-free option, and look for palm-oil-free or RSPO-certified bars if you want to minimise your environmental impact.

Sources & evidence

Every verdict on this page is traceable to the 3 references below — our own bench testing, manufacturer documentation and independent published testing. Where evidence is thin, we say so in the text rather than rounding up.

Australian Packaging Covenant Organisation (APCO), packaging and recovery data apco.org.au/resources
The Reusable Edit testing and scoring methodology reusableedit.com/about
Answer library and machine-readable data feed reusableedit.com/answers

Evidence last reviewed July 27, 2026.