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.
1 It works best for ridding plants of caterpillars, aphids, mealy bug and scale. 2  It is also possible to use liquid soap to make this solution. 3  Mix 1 - 2 tablespoons liquid soap and 950ml / 1 quart water.4  This is a contact pest controlling spray.oapy water garden spray is the most basic and simple organic garden spray that you can make at home. It often serves as a base to other garden sprays, or it can be used on its own. Soapy water can be enough to kill some pest insects when sprayed directly on them.