K18 Airwash Dry Shampoo Review: The Best Dry Shampoo for Oily Hair
I've tried every dry shampoo under the sun as someone with dark, oily hair—this is the only one that has worked!
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If you have brunette hair and an oily scalp, you already know the drill. You buy the dry shampoo everyone swears by. You spray it at the recommended distance, you wait, you rub it in. And then you look in the mirror and there's a chalky grey cast sitting on your roots like dust on a shelf.
So you try a different one. That one doesn't leave a film, but it also doesn't do anything—your hair is exactly as greasy as it was before, just now it smells like coconut. The next one works, sort of, but by hour three your scalp is itching so badly you're clawing at your head at your desk.
I have been through this cycle more times than I want to admit. Dark hair and oily roots is a genuinely difficult combination to shop for, and most dry shampoos are built for one problem or the other, not both.
K18's AirWash is the first one I've used that solved it. I use it almost every day!
Full disclosure on my bias: I've been a K18 loyalist for years. My stylist was a K18 ambassador long before the brand had its viral moment, so I was using the leave-in mask back when I'd have to explain what it was to anyone who asked.
When AirWash launched, I wasn't going in cold. I already knew the brand tends to lead with actual formulation rather than marketing, and that made me willing to spend on a dry shampoo at a price point I'd normally scroll past.
I was excited. I was also braced for disappointment, because at that point I'd been let down by roughly every dry shampoo on the market. Here's the thing I think most reviews underplay: AirWash is not an aerosol. It's a liquid mist.
Nearly every dry shampoo you've used works by spraying dry powder—starch, rice powder, silica—onto your roots to absorb oil. That powder is exactly what causes the white cast, because you are, functionally, putting a light dusting of white powder onto dark hair and hoping it disappears. Sometimes it blends. On brunette hair like mine, often it doesn't.
AirWash goes about it differently. It sprays as a liquid, and the oil-absorbing work is done by translucent microbeads rather than opaque powder. No white powder means no white film. It's a simple mechanism, and in my experience it's the reason this one works where the others didn't.
The ingredients back up the liquid approach. It's mostly water, with silica doing the oil absorption. But there are also hydrating ingredients in there—hyaluronic acid and glycerin, the same things you'd find in a good moisturizer. That's unusual for a dry shampoo. Most are purely drying, which is part of why they leave hair feeling like straw by day two.
The no-white-cast claim holds up as well. This is the headline for me and the reason it's stayed in my lineup. I can spray it at my roots, work it in, and my hair looks like clean, voluminous hair rather than hair with something on it. It also doesn't leave my scalp itching, which knocked out a good half of the products I'd tried before.
The formula uses what K18 calls odorBIND biotechnology, which is meant to trap and neutralize odor rather than coverering it with fragrance. The scent is also absolutely delicious, and I love to spray it even when I don’t necessarily need it for a fresh, clean girl scent and aura.
The application takes a small adjustment if you're used to aerosols. Because it's a liquid, your hair is slightly damp where you've sprayed for a moment before it dries down. It's not unpleasant, but it's different, and I'd rather you know that going in than be surprised by it.
There's no getting around it: this is expensive for a dry shampoo. The travel size runs around $24, and the full size is $48. You can buy a can of drugstore dry shampoo for a fraction of that. Whether that's worth it comes down to a fairly simple question—how much dry shampoo do you actually use, and how much has the wrong one been costing you?
If you use dry shampoo occasionally and the drugstore stuff works fine on your hair, this is not a necessary purchase and I'd feel odd telling you otherwise. But if you're someone who reaches for it most days, and especially if you've been cycling through bottles that don't work and quietly abandoning them half-used, the math looks different. I'd been buying and discarding dry shampoos for years. Spending more once on one I actually use daily has been much cheaper than that was!
Buy it if: you have dark hair and have given up on finding a dry shampoo that doesn't leave a cast. You have an oily scalp and need something that works rather than just adds texture. You've had reactions or itching from powder-based formulas. You use dry shampoo frequently enough that cost-per-use actually matters.
Skip it if: you have light or blonde hair, where the white-cast problem barely exists and cheaper options work fine. You use dry shampoo rarely. Or you specifically like the instant grip and volume that powder aerosols give—this is a different feel, and if that texture is what you're after, you may miss it.
This is the first dry shampoo I've ever repurchased on purpose rather than out of resignation, and it's staying in my haircare lineup permanently. If you've been through the same cycle of buying, trying and abandoning, Airwash is the one!
Shop K18’s Airwash from the K18 site or Sephora below:
