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.
Learn more about the steps you can take to safely control pests: 1  Try pest prevention first. 2  Do safely and correctly use pesticides. 3  Do dispose of leftover pesticides and pesticide containers properly.  Don't use outdoor chemicals 1  indoors. Don't assume that twice as much is better.  Don't transfer pesticides to other 1  containers. Additional resources.