Before installing artificial grass, clean a concrete floor by removing debris and loose material. Clean it with a pressure washer in a low-pressure setting. Allow it to dry completely. Then, use a degreaser or concrete cleaner to remove any stains, oil, or residues. Apply a concrete primer or adhesive before laying the artificial grass to repair any cracks or holes. Before installing artificial grass, ensure the floor is level, clean, and dry, and follow instructions. If you are unsure, consult a professional.