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.
These 'good' insects prey on many common garden insect pests, and offer the gardener a safer, natural alternative to pesticides. Click for more information about creating a Garden Mini Insectary Non-toxic and Homemade Remedies Homemade remedies are inexpensive and, best of all, you know what is going into your garden. Many homemade sprays have been used with good results to control harmful insects.