Moreover, one straightforward trick can not only deter weeds, but can also keep cats away from your garden, thus maintaining outdoor areas in good condition. Gardening expert Ish, known as gardening.with.ish on TikTok, revealed that a single common condiment is all you need to keep pests and weeds away from your lawn. Ish stated: "Today in the garden, I'm going to show you how a simple 35p white vinegar can do a lot in your garden. First things's first, white vinegar is really good at repelling unwanted pests like ants, mealybugs and even cats too. You may not realise, white vinegar can kill weeds by scorching and destroying their leaves, but it's primarily a contact killer.