How do you make an insecticide with fels-naptha?

It is by letting 1/4 -- previously grated into shavings -- of the soap bar dissolve in 1 quart (0.95 liters) of water warming over medium heat before cooling to room temperature for mixing with 1/4 cup (30 milliliters) of rubbing alcohol in 1 quart (0.95 liters) of water that fels-naptha can be made into insecticide. The spray -- which can be tested upon a plant and inspected after a 24-hour wait for apprising plant responses -- needs to soak leaves and stems from top to bottom every 2 - 3 days until the pesty attacks cease.