In such cases the weeps consist of small-diameter plastic, clay or metal pipes extending through the wall to a layer of porous backfill. Typically, weeps are arranged to direct water which may have entered an assembly from outside back to the outside.
A few of several safe household chemicals to use are vinegar, dishwashing soap and rubbing alcohol, according to an Oregon State University Extension Service publication called Using Home Remedies to Control Garden Pests, (EC 1586). The publication, complete with photos, is available free of charge online.
Some of the most effective natural remedies to keep ants out of your house can be found in your kitchen. Ants will crawl away from cinnamon, mint, red chili powder, and black pepper. All of them can be sprinkled on countertops or cupboards, as they're not poisonous and highly effective.