I used this product on the windows on both my vehicles. Its easy to spray on and wipe off. I followed up by using a second clean cloth to wipe the window down again. For the first 3-4 days the windows look really clear and clean, but after that the windows begin to fog up and require a third wipe down with a clean cloth. So, in the end I sprayed it on, wiped down the windows, wiped them down again immediately after, and finally wiped them down 4 days later to keep them clear.Edit - After using the product on two separate vehicles for almost two months I ended up throwing out the product. I had to clean the windows on my vehicles every 3-4 days to keep them from fogging up and greatly inhibiting my view through windows or mirrors. I would not recommend this product for automotive uses.