1. Put 1 tsp. of apple cider vinegar, fruit juice or wine in a small bowl of water near infested plants to trap and drown adult gnats.

2. Tempt adults to lay eggs away from plants by putting sprouting wheat grains in a container next to the plants. Bury or burn egg-laden sprouts after a few days and repeat until laying cycle is broken (8-20 days).

3. Remove 1/4 inch of topsoil and replace with diatomaceous earth (the skeletal remains of marine algae) to kill the soft-bodied larvae.

YOU did throw the cans OUT of the house, right? lol
Gnats by Drou J.
If you have a bottle of wine, leave about 1/4 inch left in the bottom. Then leave the bottle on your kitchen counter for a day or two. They are attracted to it, drink it and die! The bottom of your bottle will have a ton of dead gnats in it!

4. Use yellow sticky traps to lure and capture the gnats.