'I have greasy hair but this unusual dry shampoo kept it looking clean for four days'

As someone with long, fine hair that's prone to looking greasy at the roots after a day, I always have a to hand; I use it on my roots on day two to allow me to wash my hair every two days instead of every day. I'm not particularly fussy about which one I use (I have blonde hair so the dustiness of some of the cheap formulas doesn't bother me), but I had serious doubts about I tried recently – but I've been totally blown away buy how well it works.

The product in question is , from the haircare brand best known for the . AirWash contains technology to lift and remove odours, and absorbs excess oil without leaving residue or irritating the scalp for, K18 claims, hair that looks fresher for up to three days.

The AirWash Dry Shampoo usually costs £48, but I've found , with 20% off, taking it down to £38.40. While I appreciate this is a lot of money for a dry shampoo – especially when you can buy ones for under £5 – here's why I've been so impressed with it, and why I think it's potentially worth your money...

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I tried this out on an especially lazy bank holiday weekend, when I really couldn't be bother to wash my hair my usual regularity of every other day. As someone who hates putting unnecessary products in my hair for fear of making it even oilier-looking, when I first sprayed this into my roots, I was initially horrified: it felt wet – not the usual dry, powder feel I'm used to.

However, I had a little faith, and after a few seconds of rubbing it in, I couldn't believe the result. All dampness had disappeared, and . It also had the added bonus of giving my limp locks some much-needed volume, movement and grip without any heaviness or crispiness. It also didn't irritate or dry out my scalp at all – something I sometimes find with traditional dry shampoos. Using K18's AirWash, , instead of my usual two.

My top tips for using this would be to try to avoid getting any on your face (as it will turn to powder), massage it in immediately, and use it sparingly – you really do only need the one spritz per section as recommended on the bottle. For this reason, .

Of course, £38 is still a lot of money, and if you're looking for a slightly cheaper option that also really does feel like it 'cleans' the hair, is another long-time favourite of mine, and currently down from £26.95 to £20.

And of course, there are also plenty of bargain dry shampoo buys, including and – but for long-lasting results on my fine, limp hair, I'm so impressed with .