Considering its 10 per cent acid blend – glycolic, malic and lactic – and exfoliating fruit enzymes including papaya and pineapple, you’d expect this to be quite an aggressive exfoliant. But while it’s highly effective in smoothing rough texture, improving the appearance of pores by clearing out build-up, and generally yielding glowy, clear skin, it’s also very gentle, thanks in part to the inclusion of honey in the formula. Our tester experienced no irritation whatsoever. The best of both worlds.

A long-held favourite among beauty editors and bloggers, liquid gold lives up to the bold claim of its name. It uses 5 per cent glycolic to slough away dead skin build-up and dirt, and is highly effective on fine lines (this is great for ageing skin), pigmentation issues and acne scarring. As it doesn’t have the buffer ingredients of other serums (such as aloe), it’s one to build up use with to minimise irritation. Skin is visibly clearer and more radiant after just a week.

Among skincare companies making all sorts of claims and products with impenetrable lists of ingredients, The Ordinary offers the relief of simplicity. Its 7 per cent acid glycolic acid toner is just that, along with aloe vera, ginseng and tasmanian pepperberry to brighten and reduce irritation. It might be budget but the results are just as good as pricier products.

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This is worth the money for the packaging alone. It has a push-down pump, like the ones nail salons use for polish remover, so you can soak a cotton pad without even having to pick up the bottle. Inside the magic bottle, you’ll find a mix of phytic, lactic and fruit acids to smooth and digest dead skin cells, as well as vitamin C, E and sodium hyaluronate (hyaluronic acid) to nourish. The result is a clearer, more even-toned and brighter complexion.

This was the first exfoliating toner we ever bought for ourselves (after years of pinching our mother’s Clinique clarifying lotion) and we still wouldn’t be without it. It contains phytic and lactobionic acids (AHAs) as well as hydrating, humectant ingredients such as glycerin, sodium hyaluronate (hyaluronic acid) and several types of algae. After application, skin feels soft and clean without tightening, though it does also contain alcohol, so some skin types may find it irritating or drying.

The French pharmacy brand’s exfoliating toner is particularly good on oily or congested skin, which, combined with its low price point, makes it a perfect choice for teen skin. It contains beta-lipohydroxy acid (LHA), which is a derivative of salicylic acid and efficiently smoothes and brightens while being less acidic than other chemical exfoliants. Effective and non-irritating, it’s great on acneic skins.

This is a cult product – thanks in large part to the recommendations of beauty expert Caroline Hirons – that actually lives up to the hype. Its simple combination of 5 per cent glycolic acid and soothing aloe vera effectively dissolves grime without drying out skin, leaving it brighter, nourished and, yes, glowing. It’s also a great mid-range price, for those who love skincare but don’t want to spend their life’s savings on it.

REN’s ready steady glow may say “AHA” in its title, but it’s actually a blend of AHA and BHA – lactic and salicylic. We found it particularly effective at clearing out that in-pore build-up, so pores appear temporarily clearer and smaller, as well as the surface of the skin being softer to the touch. It does leave a slight stickiness on the skin, but we don’t mind this too much in a toner as it’s usually followed with the rest of our routine.

This, from the Hungarian spa brand, is ideal for anyone experiencing breakouts or problematic courtesy of hormones, whether that’s pregnancy, menopause or your monthly cycle. It contains salicylic acid for that skin-clearing exfoliation, as well as antibacterial colloidal silver and niacinamide, which reduces the appearance of blemishes and congestion. We reach for this whenever our skin is playing up and, alongside a stripped back routine, it helps everything get back to normal.

Glow Recipe is a Korean, New York-based beauty brand that makes products with fun packaging colours, surprising textures and gorgeous fruity scents. Its first product, the watermelon glow sleeping mask, sold out multiple times, resulting in thousands-strong waiting lists. The toner addition to the watermelon family contains both PHAs and BHAs, as well as cactus extract and hyaluronic acid, so it’s super hydrating. It’s very gentle, so would be ideal for those with sensitive skin or who are nervous about the idea of exfoliating with acids.