There are alternatives to topical treatments to get rid of warts and verrucas. Cryotherapy is sometimes used to treat warts. You’ll need to visit a clinician for this, as they have to apply the liquid nitrogen to your wart in person. But it’s usually more expensive, invasive and painful than Salactol. Cryotherapy is also generally not suitable for verrucas.
There’s also Bazuka Extra Strength Gel, which has salicylic acid in it too. But Bazuka Extra Strength Gel doesn’t have lactic acid in it. So the two ingredients can’t work together to help heal your wart or verruca.