Add it to a bit of liquid dish soap and tackle the refrigerator shelves. Pour it down a clogged drain along with boiling water. Sprinkle it around the house exterior to deter insects. Dilute and spray it to kill mildew in the bathroom. Pour it in the toilet and let sit overnight; the next day, swish with a brush and flush to get rid of rust stains. Clean countertops and walls by dissolving ½ cup in 1 gallon of hot water, pouring it into a spray bottle, spritzing it hither and yon, then wiping with a damp cloth. Oh, borax, is there anything you cannot do?
To buy: $9, drugstore.com.