Today is Ground Hog Day, and it is said if HE sees his shadow we'll only have six more weeks of winter. But if YOU look in your bathtub and see a shadow, that's another story -- most likely a little home-grown science experiment known as mildew. Once it's there, it's tough to remove, and no matter how hard or how much you scrub, the shadow of mildew lingers. Our formula for fighting mildew is simple but effective. Just add 1 quart of liquid laundry bleach to 3 quarts of warm water. Then add 1 half-cup of powdered laundry detergent, and mix well. Scrub this solution onto the fungus darkened area, keeping it wet until the black mildew turns white. When it clears up, the mildew fungus is dead. Wear rubber gloves, protect your eyes and have plenty of ventilation. And that's the On The House tip for today.