This is the best way. The best way to permanently stop weeds from growing in artificial grass is to professionally install a weed barrier underneath the artificial grass. A weed barrier is a grid that covers the ground and stops weeds from growing through artificial grass.
You can kill weeds by boiling them in boiling water. If you pour boiling water over the weeds, it will kill them without damaging the artificial grass. Boiling water will cause the weeds to wilt and die, and you can then pull them up and dispose of them after a few hours. Some weeds do have deeper root systems, and you may find that you need to pour boiling water over them a few times so you can pull the weeds out of the grass.
Sprinkle Salt On The Weed
You may need to pull out weeds at the edges of artificial grass by hand. Grab the weeds at the roots of the plants and pull them up. Try pulling out the roots too. You may need to use a screwdriver to gently lift the edge of the artificial turf. Weeds that grow on the edges of synthetic grass usually do not have their roots embedded in the material, making them easier to remove. You can also use a crab grass removal tool.