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.
Garden Pests How To. There are a number of ways to control underground pests - from trapping and flooding to poison - but master gardener Paul James prefers using a granular form of his favorite repellent: castor oil. This relatively new product does an excellent job of controlling moles, gophers and even armadillos.