So long time I never write here. Ants were gone ever since I sprayed bi weekly with bio-x pesticide on windows sills and entry points.
Just saw a few black ants in bathroom (curse and swear)! I followed one of them and it disappeared into the toilet drainage hole. My toilet got two areas, dry and wet. So that drainage which the ant disappeared is the dry area one, means no water flowing down the drainage, only mop the floor once a week.
Anyone got problem with ants coming up drainage hole???