How often to wash an oily scalp, and with what
10 min read Care know-how Updated 5 October 2026 By Anna Sophie Schulenburg
Wash an oily scalp with a mild shampoo as often as your roots need it, daily if necessary, and swap one regular wash for a clarifying one every one to two weeks. Next time you wash, massage a hazelnut-sized amount of shampoo into the wet scalp only, rinse with lukewarm water and add conditioner from ear level down. If your roots still sit loose the next morning and your scalp doesn't feel tight, your rhythm is right.
Sebum forms in the glands of the scalp, and how much of it comes is decided mainly by genetics, hormones and warmth. On fine, straight hair it travels quickly along the strands, which is why fine hair often looks lank after a single day, while curls hide the same amount of sebum for longer. Cleansing lifts the sebum off the roots before it sticks the hairs together. Afterwards your scalp should feel clean without feeling tight.
Oily scalp at a glance: how often to wash and with what
| What | How often | With what | Amount |
|---|---|---|---|
| Everyday wash | daily to every other day, as needed | mild, clear shampoo | hazelnut-sized for chin-length hair, walnut-sized from shoulder length |
| Conditioning | every wash | conditioner, from ear level down only | the same as shampoo, a little less on fine hair |
| Clarifying wash | every 1–2 weeks, or when freshly washed roots feel filmy | clarifying shampoo in place of the everyday wash | as for the everyday wash |
| In-between day | two days in a row at most | dry shampoo, on dry roots only | one short spray per parting from about 20 cm |
| Scalp scrub | once a week at most, never on your clarifying day | scrub, on a calm scalp only | as stated on the pack |
Which washing rhythm suits your roots?
Read the rows from top to bottom and take the one that best describes what you see in the mirror.
| What you notice | What's behind it | How to cleanse |
|---|---|---|
| Your roots are shiny by the evening after washing | a lot of sebum, often with fine, straight hair | a mild wash every day, one round |
| On the second morning your roots lie flat while the lengths still look good | a typical oily scalp | wash every 1–2 days, dry shampoo on the day in between |
| Right after blow-drying your roots feel waxy or heavy | residue from styling products, dry shampoo or limescale | one clarifying wash, then back to the mild shampoo |
| Your roots get oily, and your scalp feels tight or itchy after washing | shampoo too strong or water too hot | a milder shampoo, lukewarm water, one round only |
| Yellowish, greasy flakes on reddened skin | can be seborrhoeic dermatitis | see a dermatologist, more below |
Do two rows fit you? The free hair analysis asks about your scalp, your lengths and your washing rhythm separately and suggests a routine that suits all three.
How to wash an oily scalp, step by step
Step 1 — Pre-rinse. Let lukewarm water, around body temperature, run over your scalp for at least a minute while you work your fingers down to the roots. Sebum loosens well at that temperature. Very hot water strips oil faster, yet it leaves the scalp tight and dries out the lengths along with it.
Step 2 — Shampoo on the scalp only. Lather the shampoo in your palm with a little water and place it in five spots: front hairline, crown, both temples, back of the head. Massage for one minute with your fingertips in small circles and keep your nails out of it. Leave the lengths alone; the lather cleans them well enough as you rinse.
Step 3 — A second round only if it barely lathers. If the lather stays thin the first time, the sebum has bound it. Rinse and wash again with half the amount, and the second round usually lathers much better. If the first round lathers well, that's enough.
Step 4 — Rinse twice as long as you massaged. About two minutes, until no lather and no slippery feel remain between your fingers at the roots. Shampoo residue weighs the roots down and leaves a film, and the next day that looks as if they've turned oily again within hours.
Step 5 — Conditioner from ear level down. Conditioner goes on the lengths and ends only: a hazelnut-sized amount for chin-length hair, about twice that for shoulder-length hair. Leave it on for one to two minutes, rinse thoroughly and keep it away from the roots.
Step 6 — Dry the roots first. Press the water out with a towel instead of rubbing. Then blow-dry the roots on a medium setting from about 15 cm, nozzle pointing downwards, and only then the lengths. Roots that stay damp against your head for a long time dry flat.
How to tell the wash is right: after blow-drying, your roots feel textured and your scalp feels calm. If it feels tight or itchy by the evening, the shampoo was too strong or the second round was one too many. If your roots shine again within a few hours even though you rinsed for a long time, check next whether conditioner got onto them.
Does washing less often help? The myth of training your scalp
The advice keeps coming back: stretch the gaps between washes and your scalp will get used to producing less sebum. There's no evidence for it. How much sebum the glands make depends on hormones, genetics and temperature, and as far as current knowledge goes, washing every day or every third day makes no difference to that.
What actually happens when you stretch your washes is simpler. The sebum keeps building up and mixes with sweat and skin flakes, your hair lies flatter, and after a few weeks you've got used to the sight. Some scalps start to itch or smell during that time. So wash when your roots need it. With a mild shampoo, that can be every day.
If frequent washing seems to make everything worse, the cause usually lies in the wash itself. Conditioner on the roots, shampoo residue, a shampoo that irritates the scalp, or hot air from the dryer aimed straight at the roots all make them heavy sooner. If your lengths stay dry meanwhile, you need two care zones, and whether you can get oily roots and dry ends under control together depends mostly on where the shampoo and the conditioner land.
What to wash an oily scalp with
For everyday use, a mild shampoo for normal or oily hair is enough. The bottle gives you a clue: clear or slightly translucent shampoos tend to leave fewer conditioning ingredients on the roots than creamy, pearly ones, and formulas with rich oils for dry or damaged hair belong on the lengths and have no business on the scalp. Strong cleansing surfactants such as sulphates suit an oily scalp as long as it doesn't feel tight afterwards. If it does, switch to a milder formula and stick to one round.
If small flakes keep falling despite regular washing, an anti-dandruff shampoo with piroctone olamine or salicylic acid can replace the everyday wash two to three times a week. Leave the lather on the scalp for two to three minutes before you rinse.
Use a clarifying shampoo every one to two weeks instead of your everyday wash. It lifts styling residue, dry shampoo and limescale from hard water that a mild shampoo leaves behind. Whether your roots are simply oily or already carry product build-up on hair and scalp shows in how they feel right after washing. Sebum only comes back after a few hours; build-up is there straight away.
Dry shampoo bridges one day, two at most. It absorbs sebum and makes the roots look fuller, yet it removes nothing, so a proper wash has to follow. Spray it from about 20 cm, parting by parting, onto dry roots, leave it for one to two minutes and brush it out. If your roots get very oily, you can apply it the evening before. Whether you can use dry shampoo without a grey cast comes down mostly to distance and amount.
A scalp scrub loosens residue as well, but it belongs only on a scalp without redness, burning or broken skin. How often a scalp scrub makes sense and when it becomes too much depends on how much dry shampoo and styling product you use.
If you use MONAT: The Purifying Vinegar Shampoo takes over the clarifying wash every one to two weeks; on the other days you wash with your mild shampoo. The Studio One™ The Champ™ Conditioning Dry Shampoo takes the shine off your roots on the in-between day and doesn't replace a wash. Use the Scalp Purifying Scrub on a clarifying day instead of the vinegar shampoo, never both on the same day, and only on a scalp without redness. A clarifying wash with Purifying Vinegar also ends with conditioner on the lengths.
Washing an oily scalp by hair type
| Hair type | Rhythm | Shampoo and amount | Conditioning | What to watch |
|---|---|---|---|---|
| Fine and straight | often daily | one round, hazelnut-sized | light conditioner from chin level down | blow-dry the roots upside down so they don't lie flat |
| Thick and dense | every 1–2 days | walnut-sized, onto the scalp section by section | conditioner from ear level, a mask on the ends once a week | rinse for a long time, as shampoo easily gets caught in dense hair |
| Curls and waves | every 2–3 days, dry shampoo on the roots only in between | shampoo on the scalp only, don't rub the lengths | rich conditioner on the lengths, never on the roots | work dry shampoo in with your fingertips, as a brush breaks up the curl |
| Coloured or bleached | every 1–2 days | mild shampoo, clarifying every two weeks at most | a moisturising conditioner on the lengths after every clarifying wash | clarifying shampoos can make colour fade faster |
| Short hair | daily without a second thought | pea-sized | often no conditioner needed | sebum reaches the ends quickly, so the wash is short and frequent |
Common mistakes and what to do instead
- Rubbing shampoo into the lengths → massage only the scalp; the lather cleans the lengths as you rinse.
- Washing hot and blow-drying hot → wash lukewarm, dryer on medium from 15 cm.
- Conditioner right up to the roots → only from ear level, from chin level on fine hair.
- Rinsing after half a minute → rinse for two minutes, until no slippery feel remains.
- Clarifying shampoo as your everyday wash → every 1–2 weeks, a mild one on the other days.
- Dry shampoo three days running → wash properly again after two days at most.
- Washing less often to retrain your scalp → wash when your roots need it.
- Using the same pillowcase and brush for weeks → change the pillowcase once a week and wash the brush out with shampoo every one to two weeks.
When a dermatologist should take a look
Yellowish, greasy flakes on red, itchy skin, often on the eyebrows or beside the nose too, belong with a dermatologist, because they can point to seborrhoeic dermatitis, which needs medical treatment. If your scalp suddenly gets much oilier than before and spots, increased hair loss or an irregular cycle come with it, ask your GP or gynaecologist to check your hormones, because there may be a hormonal cause behind it. Flakes that haven't eased after four weeks of anti-dandruff shampoo are a reason to see a doctor as well. Before the appointment, you can narrow down yourself whether your flakes point more to a dry scalp or dandruff.
Quick questions
Does an apple cider vinegar rinse help an oily scalp?
Hardly. A tablespoon of apple cider vinegar in 250 ml of water after shampooing can loosen limescale residue, while the shampoo is what removes the sebum. Undiluted vinegar irritates the scalp, and the smell lingers until your hair is dry.
Can I use cornflour or baby powder as dry shampoo?
Yes, on light hair. Dab a pinch onto the roots with a large brush, wait a minute and brush it out thoroughly. On dark hair a pale cast stays visible.
Does bicarbonate of soda help degrease the scalp?
No. Bicarbonate of soda is alkaline, roughens the cuticle of the hair and can irritate the scalp. A mild shampoo removes oil more reliably and leaves the lengths smoother.
Why do my roots get oily faster in summer?
Because warmth makes sebum more fluid and sweat adds to it, so both spread along the hair faster. One extra wash a week is normal in summer, and after exercise lukewarm water with a small amount of shampoo on the roots alone is often enough.
Does a cold final rinse stop roots getting oily so fast?
No. Cold water doesn't change how much sebum the glands make, and water can't close pores. A cool splash at the end feels fresh and does no harm; for the wash itself, lukewarm water remains the better choice.
Is it better to wash oily hair in the morning or the evening?
In the morning, if you want your roots to sit loose until the evening. Overnight the pillow presses freshly washed roots flat, and by then the night's sebum is already in your hair.
How often your roots need a wash and what care your lengths get alongside it is what the free hair analysis sorts out for you.