I like the weed killer idea. I have never like spraying chemicals around my place for fear it might get to my big trees. THANKS.HEB sells an extra concentrated vinegar 9% acidity as opposed to standard vinegar's 5% acidity. I use the heck out of it for water spots, and to remove calcium build up.
On a completely unrelated note, if you add a cup of salt with a long squirt of Dawn to a gallon of that vinegar it's a great weed killer.