-ANTS
Ants are even more difficult to remove than cockroaches, but they have a weakness. Like most animals, they adore honey. The workers consume liquids, but the queen and her baby larvae eat solid food, so you’ll need the best of both worlds to eliminate them. For the solid “food”, mix Borax and powdered sugar in a 1:3 ratio. For the liquid, mix ¼ cup of Borax with ¾ cup of honey. Put the “foods” in the areas frequented by ants and onto flat surfaces as well, and you’ll say goodbye to the colony soon!
-FLEAS
Borax is a great solution against fleas as well. They can be difficult to spot and remove, but Borax can kill them and their eggs and keep your house flea-free for up to a year. Before using it against the pests, clean and vacuum your house – move the furniture and make sure to vacuum all hard-to-reach areas as fleas are known to hide in dark spots.
Now, sprinkle some Borax onto your carpets and every crease in your home, and make sure to cover the areas where your pets sit often too. Work the powder in the fabric nicely and vacuum the excess. Keep your pets and children away from home in the next 36 hours in order to prevent them from coming in contact with the powder which can have serious consequences on their health. After 36 hours, vacuum your house again and you will get rid of the fleas!
Source: http://justnaturallife.net