Then, pour boiling water down the drain. Compost vegetable scraps and yard waste into a naturally rich soil additive. Mix 3 tablespoons baking soda with one quart warm water. Sprinkle cream of tartar along ant's path. They will not cross over it.
Place screens over drains.
Use mechanical-snap rat traps. Only buy the amount of material that you will need. Read the labels carefully before purchasing. Give excess material to charities, neighbors or friends. Use a nonhazardous substitute in place of hazardous materials whenever possible.