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These are great homemade options for those who dislike using premixed pest control.
If you find that you are being invaded by those small ants, or even the larger ones, don't run to the store for ant killer, just run to your laundry room and get the commercial spray that you use for removing stains.
Kill ants for good with uncooked grits! Just sprinkle the grits around where you have the ants and they eat them and die. Ants lack the ability to expel gas caused by the grits.
To kill ants, mix equal parts of borax and powdered sugar with just enough drops of water to make a paste. Place on pieces of cardboard where you see ants. This works both inside and outdoors within hours.
If you are dealing with the tiny black ants, I use non-stick spray to kill them around the sink. That way I don't have to worry about it getting any on the dishes.I really like this, it kills them dead with one spray.
I have 2 ways. I used to live way out in the country and have ants everywhere and both of these worked every time. And they are very safe.
Use dry corn meal sprinkled where you see ants. They were coming up through the edge of the carpet and tile so I lifted the corner of the carpet enough to see them coming through a tiny hole. I put a small amount (less than 1/2 teaspoon) of corn meal on the tile and brushed it into the hole and carpet.
I read a hint about Sweet'N Low on ThriftyFun a month or two ago as I have a problem every spring with ants coming into my kitchen. I sprinkled two packages of Sweet'N Low on the window sill where they were coming in and have not seen any ants since.
I tried nearly every product on the market to get rid of ants that made hills in cracks on my garage floor. The ants actually caused my garage floor to heave because they burrowed deep into the cracks and made hills.
When we lived in Texas, I discovered that soapy water was the most effective tool against fire ant mounds. I used one gallon (recycled milk jug) of hot water and added about a teaspoon of dish liquid.
Boric acid is a common ingredient in homemade recipes for killing ants. This page is about using boric acid for controlling ants in garden and kitchen.
Sugar ants find their way to where sweet stuff can be found. A homemade trap can be an effective way to get rid of them. This is a page about making a borax and honey ant trap.