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.
Beat the bugs with simple home remedies. An all-purpose pest control agent that controls 100 percent of garden bug varieties 100 percent of the time doesn't exist -- in either the commercial or home remedy world. The best anyone can hope for is a fighting chance against the insect population when it comes to gardening.