In the never-ending Instagram grid of shiny, new beauty products, it’s hard to know which ones are worth your money and which ones aren’t.

Hot tip: The best sign of a genuinely decent beauty product is… an empty one.

If it’s been squeezed and flattened within an inch of its life or pulverised right down to the silver pan, you can trust it’s for good reason.

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In order to unearth some truly great beauty recommendations, we asked four women in the beauty industry to show us their most recent empties.

Keep scrolling for the skincare, makeup, hair and body care products they loved right down to the very last drop.

Hannah English, science-led skinfluencer (@ms_hannah_e).

1. Asarai Come Clean Cleanser, 75ml for$36.

Asarai Come Clean Gel cleanser is a gel-oil product suitable for makeup removal/a first cleanse. It has the most divine silky texture. This is one of my top five cleansers for sure – makeup just glides off! It’s fragrance-free (a bonus for sensitive skin) and nourishing with vitamin-rich Kakadu Plum extract, too.

2. The Ordinary Squalane Cleanser, $13.90 for 50ml or $34.90 for 150ml.

Works as a first cleanse or second cleanse. It’s a creamy oil-gel texture too, less oily and more creamy than the Asarai. I already have a new one of this. It’s fragrance-free too and never stripping, thanks to loads of squalane – a buzzy moisturising ingredient that mimics skin’s natural oils without clogging. For the record, it *does* come in a bigger tube.

Asarai Come Clean Cleanser and The Ordinary Squalane Cleanser. Image: Supplied/Hannah English.

BONUS: You can readMamamia's review of The Ordinary Squalane Cleanser here.

3. Bondi Boost Hair Growth Conditioner, $32.95 for 300ml.

My hair grew so quickly using the Bondi Boost products. This conditioner is hydrating but lightweight so great for finer hair or for a co-wash on coarse hair. It also smells like candy canes... I’m scared to stop using it in case my hair goes back to how it was before, to be honest.

BONUS: You can readMamamia's review of the Bondi Boost hair Growth range here.

4. Pureology Strength Cure Best Blonde Shampoo, $39.99 for 250ml.

This is Pureology’s strengthening line but with added purple tones to combat brass. I don’t understand why more brands haven’t made a shampoo that tones without drying, and addresses the full spectrum of needs for blonde hair! Genius! It's my current favourite blonde shampoo.

5. Davines Nounou Nourishing Repairing Mask, $44.95 for 250ml.

Nounou is… well, if you know, you know. Bleached, coarse, curly, or damaged hair are all smoothed and made new again with Nounou. It is EVERYTHINGGGG. I’ve finished about three of these now, and the magic is somewhere in the anti-static ingredients, hydration, moisturising oils for hair that needs weighing down, and an ingredient called dimethicone to trap it in. If your hair needs HELP, this will help. Will buy again forever.

Davines Nounou Nourishing Repairing Mask. Image: Supplied/Hannah English.

6. Sebizole Shampoo 2%, $12.99 for 200ml.

If you’re prone to a flaky scalp, don’t waste your time with natural remedies. Just go to the pharmacy and get this. My flakes are gone after one wash, every single time. I use this about once a month and alternate with a colour toning shampoo to keep my blonde bright.

7. Glow Recipe Watermelon Glow Pink Juice Moisturizer, $62 for 60ml.

This one does contain fragrance, although I wasn’t bothered by it. For me, it’s more of a hydrating serum than a full-on moisturiser. Perfect for me for summer! I think it would be great for oily skin types year-round. Or to just add some fun to your routine?

8. Zelens Triple Action Advanced Eye Cream, $147.20.

The texture of this, I’m telling you, phew. Gorgeous. It’s super silky with peptides to prevent puffiness and dark circles. It’s beautiful under makeup for me, but for those who need LOTS of under-eye moisture, you might find it’s not enough. I would absolutely buy this again and absolutely plan to.

Glow Recipe Watermelon Glow Pink Juice Moisturizer and Zelens Eye Cream. Image: Supplied/Hannah English.

Brittany Stewart, host of the Beauty Island podcast (@brittanybeautybts).

9. Ultra Violette Supreme Screen SPF 50+ Hydrating Facial Sunscreen, $45 for 50ml.

I have literally squeezed every last drop out of this. It’s seen me through a summer in Europe and a summer in Australia and has firmly earned a place in my routine. It's the perfect sunscreen skincare hybrid – lightweight and works brilliantly as a primer under makeup.

Ultra Violette Supreme Screen. Image: Supplied/Brittany Stewart.

10. NIP+FAB Glycolic Fix Daily Cleansing Pads, $34.99 for a 60 Pack.

Chemical exfoliants (that use acid ingredients to dissolve dead skin cells) are great if you’re like me and are impatient to see the results of using any skincare product. This is gentle enough for my skin but still exfoliates skin to leave a noticeable glow after a few days.

NIP+FAB Glycolic Fix Daily Cleansing Pads. Image: Supplied/Brittany Stewart.

11. Smashbox Photo Finish 24 Hour Eye Shadow Primer, $35.

I was always skeptical about whether eye shadow primer was even necessary – until I tried this. Now, I won’t ever do my eye makeup without it. Eye shadow stays without budging or sm