Are dad's driveway and garage floor covered with years of grease and oil stains? Surprise him with our secret formula for cleaning greasy stuff. First, take some cat litter and spread it around on the grease and oil; thoroughly grind it in; walk and twist around on it; sweep it up; finally, open up a can of cola. Pour the soda on the floor and wet the stains. Work the soda in with a stiff broom -- but don't let it dry. Once the cola quits fizzing, rinse with water. Then brighten any trace stains with a solution of 1 cup of liquid chlorine bleach and 1 cup of powdered laundry detergent in 1 gallon of very hot water. And that's the On The House tip for today.