Hi! Well, I have a rwd car with summer tires and the fwd car is out of town. The small amount of sleet on the road has trapped me in the house. The weather guy said we'd be cool until noon, but who believes him anyway. Well, I'm a little unprepared (I know, I know) so I need a ghetto way to deice a small patch on my back deck so I can let the dog out without breaking our necks. I'm sure table salt works well, but how much should I use? I don't want to waste it, not...