Ants

30 Natural Ant Killing Remedies.

[Subset of top single ingredients remedies that sound good to me]

Baking Soda [they recommend most a bait with it]
Vinegar
Lemon Juice
Food Grade Diatomaceous Earth
Cayenne Pepper
Dish Soap
Fresh Garlic
Peppermint Oil
Rubbing Alcohol
Clove Oil
Salt
Cornmeal [makes em explode]
Red Chili Powder
Creme of Wheat [uncooked...makes em explode]
Chalk [blockage]
Vasoline [blockage]
Cinnamon [deterrent]
Bay Leaves [deterrent]
[Aspartame...ant neurotoxin...maybe this doesn't so good to spread around]

They fail to mention an old classic, no messy ingredients at all, entirely biodegradeable:

Boiling Hot Water straight from the stove



And I suppose this is possible, sometimes:

Dig em up and dump em somewhere else.