1.Never let food or water be in the open for long.
2.Clean places where pests come usually.Eg-Beds, Cushions, Sofas Drying them in open sunlight is a good idea
3.Use napthalene balls in your cupboards, closets and other places where you keep clothes
4.Spray Pest-removing sprays in those places which are pest prone at least twice a month
5.Regularly clean bathroom drains and kitchen drains.