You need a proper selective weed killer. Some need a license to use in theory but you can usually order from eBay no questions asked.Front and back grass getting loads of dandelions. I tried digging the roots out about 5 years ago but it ended up looking like the moon with craters all over. Since then I just pull the bulbs (oooer) off and use the weed killer lawn spray but they’re still going strong. What’s the next step?