One product is thifensulfuron (Harmony) and the other is flumetsulam (Preside). These also need follow-up applications to give 100% control, with flumetsulam being more selective to clovers than ...
However, if applied while stinking mayweed is still a young seedling, good control can be obtained in pastures with herbicides such as bentazone (Basagran, or Pulsar), flumetsulam (Preside) and ...