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I hate de-weeding. It's arguably the worst gardening job out there; in fact, I'd rather mow my lawn ten times over than de-weed my patio.So, when I discovered this genius weed-killer hack and quickly realised I already had the one ingredient it required under my kitchen sink, I felt like I'd mastered the game.Usually, I tackle my weeds with a mix of white vinegar and boiling water. Admittedly, this method works, but it takes a few tries. It's great because it's completely pet-safe, but weeds do return rather fast.I'll still be using this for my yard where there are larger patches of weeds, and where my dog often visits, but at the moment my front porch patio is out of control, so instead of vinegar and boiling water, I'll be giving biological laundry powder a try.Yes, this recently viral weed killer hack isn't just convenient, but it actually works!So what exactly is the biological laundry detergent weed killer hack?Not only can this magic powder prevent weed growth, but it also adds a pleasant scent to your paving slabs. "Biological washing powder is something a lot of us already have at home, yet very few people think to use it outside," claims Bill Jarvis, an expert and co-founder of patio paint supplier Premium Paints."It can be a handy option for weeds growing in the joints between paving slabs, especially if you catch them before they become established," he adds.Get instant access to breaking news, the hottest reviews, great deals and helpful tips.This is a genius gardening hack for those narrow gaps in your yard where you've noticed weeds normally thrive. This way, you can easily stay on top of your tidy patio, and you won't find yourself panic spreading weed killer before hosting a family barbecue.How to use laundry powder on your weeds