Cleansers: pH, sulfates and whether double cleansing is worth it in Indian weather
The squeaky-clean feeling people chase is the one reliable sign that a cleanser is too harsh.
Cleansing is where most routines go wrong, because the feedback signal people trust is backwards. Skin that feels tight and squeaky after washing has lost part of its lipid film - which is a small injury, repeated twice a day, that the rest of the routine then spends money repairing.
pH, in one paragraph
Healthy skin surface sits slightly acidic, around pH 4.5 to 5.5. That acid mantle supports barrier enzymes and discourages unhelpful bacteria. Traditional soap is strongly alkaline, often above pH 9, which is why it cleans so efficiently and why it leaves skin feeling stripped.
Syndet bars and gel cleansers formulated near skin pH clean adequately and leave the mantle roughly intact. For the face - especially skin using retinoids, acids or vitamin C - that difference compounds over months.
Sulfates, in proportion
Sodium lauryl sulfate is a genuinely aggressive surfactant and is used in research as a standard irritant. Sodium laureth sulfate, the one usually in face and body washes, is milder. Neither is dangerous; both can over-clean dry or sensitive skin.
The useful reframing is that sulfate-free is not automatically gentle - a sulfate-free cleanser with a high pH can strip more than a well-buffered sulfate one. Judge by how your skin feels ten minutes after washing, not by the claim on the tube.
The ten-minute test: if your face feels tight, itchy or needs moisturiser urgently ten minutes after cleansing, the cleanser is too harsh for you, whatever it says on the front.
Types, and who they suit
| Type | Suits | Watch out for |
|---|---|---|
| Gel and foaming, pH balanced | Oily and combination skin, humid weather | Over-use; twice a day is enough |
| Cream and milk | Dry and sensitive skin, winter | May not remove heavy sunscreen alone |
| Micellar water | Quick removal, travel, no-rinse situations | Leaving residue on; rinse when you can |
| Cleansing oil and balm | First step for sunscreen and makeup | Choosing one that leaves a film you dislike |
| Syndet bar | Body, and faces that prefer a bar | Ordinary alkaline soap sold as a face bar |
| Medicated wash (salicylic, benzoyl peroxide) | Acne-prone skin | Daily use from day one; build up |
Double cleansing, honestly
The idea is simple: an oil-based first step dissolves what water cannot - sunscreen, makeup, sebum, pollution - and a water-based second step removes the rest.
It earns its place if you wear water-resistant sunscreen, long-wear makeup, or spend the day in traffic. It is unnecessary on a bare-faced day, and doing it anyway is just cleansing twice.
For Indian summers there is a practical middle path: oil cleanse in the evening only, single cleanse in the morning, and on the days you wore nothing but moisturiser, rinse and move on.
A routine that matches real days
- Morning: a gentle cleanser, or plain water if your skin is dry and you cleansed properly the night before.
- Evening: remove sunscreen properly. This is the one cleanse that is not optional.
- After the gym: rinse sweat off reasonably soon; salt and friction under a helmet or mask are a common cause of breakouts along the jaw.
- Lukewarm water, never hot. Hot water feels wonderful and strips lipids efficiently.
- Pat dry, do not rub, and apply moisturiser while skin is still slightly damp.
Cleanser is also the product to spend least on. It is on your face for thirty seconds and then goes down the drain - the expensive actives in a rinse-off product mostly go with it.
Every score on Filtizy is shown working
The factors, weights and thresholds behind a product's number are published in full - including the ones we consider weak.
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