Abstract: An aqueous cleaning fluid is provided for retarding electrolysis between dissimilar metals in an electrical circuit and removing contaminates and metal said from electrical conductors. This reduces resistance within the circuit and increases circuit efficiency. The fluid is a complex of naturally occurring essential oils mixed with a surfactant mixture to form a concentrated solution. The concentrated solution is diluted with distilled water and drying agents to levels suitable for application in field operations at or near a job site. The cleaning fluid is applied to conductors within a circuit with a spray bottle. The electrical circuit is taken off line, the conductor surfaces are exposed, and the conductor surfaces are wetted with cleaning fluid until some of the cleaning fluid drips from the conductor surface. Then the circuit is reassembled and the circuit is put on line.

Abstract: A portable positive dead bolt lock temporarily installed in a door frame and then removed and carried from one location to another to present, while temporarily used, a positive dead bolt lock. A planar lock plate is provided having a tab flange extended laterally into a notch opening in the door frame when installed, and an opening large enough to permit passage of the head of the dead bolt. An entry slot is provided from the opening extended to a pair of slot extensions therein in diverging relationship relative to the entry slot with one of the slot extensions extending up and the other extending down. Each of the slot extensions having one edge presenting a plurality of seats each presenting a vertical seat edge. The dead bolt having a groove between a head and the bolt body permitting passage of the bolt through the entry slot and into the slot extensions. Springs bias the lock plate toward the door frame when the door is closed.