Purifying Vinegar routine: how often and how to combine it
9 min read Care know-how Updated 5 October 2026 By Anna Sophie Schulenburg
You build Purifying Vinegar into your routine as a clarifying wash: every one to two weeks, MONAT's Purifying Vinegar Shampoo replaces one normal wash, conditioner goes on the lengths afterwards, and on every other wash day you keep your usual shampoo. Start with the shampoo on its own and add the Purifying Vinegar Rinse only if you style a lot or have hard water. Whether the interval is right shows in your lengths once they are dry. If they stay soft, it fits. If they feel rougher after each clarifying wash, you are clarifying too often.
Purifying Vinegar is MONAT's clarifying scalp line. It is made for roots that turn oily quickly or sit under a film of styling residue, dry shampoo and limescale, known as build-up. The line washes away whatever has settled on the scalp and roots. If you first want to know where that film comes from and how to shift it without a special shampoo, start with what causes product build-up on hair and scalp.
What the Purifying Vinegar line includes
The line is made up of three separate products, each with its own job. In this article, “conditioner” means your usual conditioner and “the Rinse” means the Purifying Vinegar Rinse from the line.
| Product | Job | Where it goes | When |
|---|---|---|---|
| Purifying Vinegar Shampoo | cleans scalp and roots more thoroughly than an everyday wash | on the scalp only; the lather cleans the lengths as you rinse | replaces your normal shampoo on clarifying days |
| Purifying Vinegar Rinse | a second clarifying step for weighed-down hair | scalp and lengths | on the same wash day, after the shampoo and before conditioner |
| Scalp Purifying Scrub | loosens a thick layer at the roots mechanically as well | on the scalp only | on a clarifying day, instead of the shampoo |
The ingredient list, the scent and the Rinse's leave-on time are printed on the pack. If your scalp has ever reacted to a new shampoo with itching or redness, read the list before the first use and try the product on a small patch behind your ear. If that spot stays calm for 48 hours, with no redness and no itching, you can wash your whole scalp with it.
Is Purifying Vinegar right for your scalp?
What you notice at the roots decides it. Your hair type hardly matters for this choice.
| What you notice | What is usually behind it | Purifying Vinegar? |
|---|---|---|
| Your parting shines by day two, a few strands stick together at the roots | roots that get oily fast | yes, the shampoo every one to two weeks |
| Heavy straight after washing, roots feel filmy, shampoo barely lathers | build-up from styling products, oil or silicones | yes, one clarifying wash straight away, then on a rhythm |
| A whitish layer along the parting after several days of dry shampoo | powder residue | yes, once a week |
| Your lengths have felt rough and dull since you moved house | limescale from hard water | yes, shampoo and Rinse on the same day |
| Your scalp feels tight after washing, fine dry flakes land on your jumper | dry scalp | no, moisture is what's missing |
| Redness, burning, weeping or crusted patches | irritated or inflamed skin | no, see a doctor first |
Do two rows apply that point in different directions? The free hair analysis asks about scalp, styling and hair length together.
If your scalp feels tight and your roots still get oily fast, the stronger of the two sensations decides whether you start with soothing or clarifying scalp care. Add the other direction after four weeks at the earliest, once you know how your scalp responds to the first.
How often to use Purifying Vinegar Shampoo
The interval depends on how much product you put on your hair and how hard your water is. The table gives you a starting point for the first four weeks.
| Your situation | Vinegar shampoo | Add the Rinse |
|---|---|---|
| Daily styling, dry shampoo on three or more days a week, wax or pomade | once a week | yes |
| Roots that get oily fast, little styling | every one to two weeks | only with hard water |
| Hard water above about 250 mg/l (14 °dH) | every one to two weeks | yes |
| Occasional styling, oil or leave-in on the lengths | every two to four weeks | rarely needed |
| Coloured or bleached, lengths still supple | every two to four weeks at most | only with hard water |
| Red, burning or broken scalp | not at all until it has calmed down | not at all |
Your water supplier's website lists the hardness, usually by postcode. An acidic rinse dissolves limescale residue on hair and scalp, which is why the Rinse earns its place mainly in hard-water areas. Even with heavy styling, stick to once a week at most for the vinegar shampoo.
On every other wash day your base shampoo stays. If you wash three times a week, clarifying weekly makes every third wash a clarifying one, and clarifying fortnightly makes it every sixth. Give clarifying its own fixed day of the week and you won't need to count.
The clarifying wash with shampoo and Rinse
Step 1 — Prepare. Brush your hair through while it is dry so nothing tangles while you clarify. Then wet it with lukewarm water for a full minute, until the water reaches the scalp. With thick hair this takes longer than it feels.
Step 2 — Shampoo on the roots. Take the amount from the table below and apply it straight to the scalp along three partings: above the forehead, on the crown, at the back of the head. Massage for one to two minutes with your fingertips and keep your nails out of it. Leave the lengths alone. If it barely lathers, rinse and go again with half the amount.
Step 3 — Rinse out, then the Rinse. Rinse with lukewarm water for at least a minute and let the lather run through your lengths; that cleans them enough. If the Rinse is part of your rhythm, spread it over scalp and lengths now, leave it on for as long as the pack says and rinse it out.
Step 4 — Condition the lengths. Apply your conditioner from ear level down, leave it for two to three minutes and rinse. If you use MONAT, take the conditioner from your base system, for fine hair the Revive™ Conditioner, for example. Skip leave-in and oil that day or use half the usual amount, so once your hair is dry you can see how it falls without the film.
| Hair length | Vinegar shampoo | Conditioner on the lengths |
|---|---|---|
| chin-length | hazelnut-sized | hazelnut-sized |
| shoulder-length | walnut-sized | walnut-sized |
| chest-length and longer | walnut-sized, a little more for thick hair | two walnut-sized amounts |
Combining Purifying Vinegar with other products
| Combination | How it fits |
|---|---|
| Your base shampoo and conditioner | On clarifying days the vinegar shampoo replaces your base shampoo. Your base conditioner stays. |
| Scalp Comfort™ | Introduce the two lines one after the other: watch the first for four weeks, then add the second, on different days. |
| Scalp Purifying Scrub | Take turns with the shampoo on clarifying days, never both on the same day. |
| Dry shampoo | Two days in a row at most, then a proper wash. With three dry-shampoo days a week, clarify weekly. |
| Hair oil such as REJUVENIQE® | On clarifying day, one or two drops on the ends only, never at the roots. |
| Purple shampoo | On a different wash day from the clarifying wash. |
To find the base shampoo that suits your roots, go by the MONAT shampoo for your scalp type. Whether a scalp scrub for residue at the roots is an option depends on how robust your scalp is. With thin skin that reddens quickly, stay with the vinegar shampoo.
How to tell the rhythm is right
| When | What you check | What you adjust |
|---|---|---|
| Once the first clarifying wash has dried | Pull a strand from the back of your head between thumb and forefinger. Smooth and slightly squeaky means clean. | If it still feels waxy, do a second round with half the amount next time. |
| On the evening of clarifying day | Does your scalp feel tight or itchy? | Next time skip the Rinse and double the interval. If it burns, stop. |
| After four weeks | Do your lengths stay soft, or feel rougher after each clarifying day? Note how many days it takes for your roots to look filmy again. | Rougher lengths: double the interval and use more conditioner. Film back after two days: clarify a week earlier. |
How fast your roots get oily again depends on your genes, your hormones and the season. A clarifying wash changes none of that; it only lifts the film. So you judge the rhythm by your roots the day after washing and by your lengths.
Mistakes that leave the lengths like straw
- Vinegar shampoo at every wash → every one to two weeks, with your base shampoo in between
- Rubbing the vinegar shampoo into the lengths → scalp only; the lather as you rinse is enough for the lengths
- Skipping conditioner after clarifying → from ear level down, left on for two to three minutes
- More leave-in to fight the heavy feeling → clarify first, then use half the amount
- A clarifying wash in the first two weeks after colouring → wait until after that, ideally the week before your next appointment, because freshly coloured hair otherwise loses colour faster
When to leave Purifying Vinegar out
The line is the wrong choice if your scalp feels tight after washing, if fine dry flakes fall, or if your hair is bleached and so brittle that it snaps when you comb it and soaks up any conditioner instantly. In these cases moisture is what's missing, and a clarifying wash leaves scalp and lengths rougher.
Redness, burning, weeping or crusted patches, and itching that hasn't eased after two weeks without new products, are for a dermatologist to look at. They can come from eczema, psoriasis or a contact allergy, and none of these goes away with a clarifying wash. Until you have been seen, wash with a mild shampoo and leave the vinegar shampoo, the Rinse and the scrub in the cupboard. How you wash a sensitive scalp in the meantime depends on what it reacts to.
1. SCALP CARE SYSTEM
Amount: As on the labelWhere: Apply to the wet scalp and roots, work in gently and rinse out thoroughly.How often: Not at every wash; as a clarifying treatment usually once or twice a week, as on the label.
On that day the clarifying cleanse replaces your usual shampoo rather than adding to it. A follow-up conditioner or rinse still makes sense, especially through the lengths. Use only on a non-irritated scalp.
Quick questions
Do I need all three products in the line?
No. For most people the vinegar shampoo is enough. The Rinse comes in with hard water or heavy styling, and the scrub replaces the shampoo on some clarifying days when the roots are heavily coated.
Can I use apple cider vinegar from the kitchen instead of the Rinse?
Yes, for limescale: one tablespoon of apple cider vinegar in half a litre of water, left on for a minute, then rinsed out with clear water. The mixture won't shift styling film or oil, which takes a shampoo. Undiluted, vinegar stings on the scalp and in the eyes.
Can I clarify more often in summer?
Yes, up to once a week, if your roots get oily faster in the heat or you use more styling products. After a week of swimming in the pool every day you can bring the clarifying wash forward, then put plenty of conditioner on the lengths.
Can I use the vinegar shampoo on curly hair?
Yes. Gel, cream and leave-in build up easily in curls. Clarify at the rhythm the table gives for your styling, let the lather alone clean the lengths and follow with plenty of conditioner.
Does the vinegar shampoo help with dandruff?
No. Yellowish, greasy flakes on reddened skin can be seborrhoeic dermatitis and belong with a dermatologist. Fine, dry flakes need moisture rather than a clarifying wash. For ordinary dandruff without redness, an anti-dandruff shampoo is the right product.
The free hair analysis uses your answers on scalp and styling to sort out whether your roots need a clarifying wash every week, every two weeks or not at all.