Need I say more. It works and it works beautifully, even as an emergency de-icer! Buying a case of this stuff for the Amazon sale price  woith free shipping was kind of a no-brainer.  Plus good to stock up before the coming sales tax fiasco. Although I like the convenience of the big Spray bottle (which has a stellar diffuser), This large size bottle is still much smaller, easier to store in the car and significantly cheaper than buying the sprayer, unless you find a good sale. I think on the spray verison you are paying $2-3 just for the packaging, I don't really seem to get more covverage with that one an it does not seem to last as long as this large bottle. Everyon got a bottle for Chirstmas this year (except the kids).