I have recently installed an irrigation system, and since the lawn was in such sad shape before I installed the irrigation system I have decided to kill everything. I initially spayed a 2-1/2% mixture of Roundup, which did a good job at killing most everything. Then a week later I sprayed a 3% mixture of Roundup and went after some of the weeds that really didn't seem to be effected by the initial spraying. I have what certain appear to be Wild Strawberries in my lawn, and I have attempted to kill them twice, and I wonder if there is anything else I can try. I really want to make sure everything is dead before I decide to seed, and this seems to pretty much be about the only thing left. Any suggestions?