Using generic glyphosate 41% with surfactant already added have had fairly good results by might need to repeat spray. Used Poast Plus which supposedly has surfactant also to kill grass in a clover field and had to spray 2-3 times to be effective. Do you recommend adding additonal surfact to Glyphosate and Poast Plus. Will it be more effective? If so what kind of surfactant do you recommend? I am not at the property full time so don't have a lot of flexibility. Thanks!