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.
Try combining some of your household products and get your own homemade pest solution. Check out the ideas and helpful homemade remedies below, to keep your house and garden free of unwanted guests. For outdoor pest-control, try cooking up this Hometalker's mixture of Garlic-Mint spray.