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.
Killing Garden Pests. Homemade insecticidal dish soap sprays -- such as ones made with Dawn dish soap and water -- don't bother most beneficial insects, including ladybugs and bees.ardeners and farmers began controlling insects with soap sprays 200 years ago. Homemade pesticide sprays containing Dawn dish soap successfully kill some garden pests, including spider mites.