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.
Slugs, moths and ants are just a few of the vinegar-phobic pests in your garden. Once your vinegar solution is mixed up, spray only the leaves of your garden plants about once each week. You can also create an invisible wall for those insects that crawl into the garden by spraying around the garden's perimeter.