What product to buy to keep ants out of the house?

I’ve just discovered ants all around our kitchen sink though we can’t find the source. My husband has looked all around the whole water system with no luck and wants me to buy something like ajax to pour down the sink. Is this the best product? Anyone else ever had ant problems? Advice greatly appreciated.

Buy cinnamon at the $I store sprinkle along the foundation on the outside of your house – I lived in a log cabin for 8years and used this myself to keep out ants and it always worked -