It's the 4th of July -- a day off for most. But let's say you're sitting around relaxing on your patio. Just as you're about to squeeze some lemon into a nice cool drink, you notice some annoying rust stains on the concrete caused by your aging metal outdoor furniture. Being the perfectionist you are, it bothers you. What can you do about it? Should you set down your drink and go in search of cleaning solutions and a wire brush? No need for that! The answer is at hand -- literally. We refer to the lemon in your hand. First finish squeezing it into your drink, then simply reach down and rub what's left on the rust stains. Then wipe with a soft towel or cloth, and they'll disappear. And that's the On The House tip for today.