I am not sure whether the product you refer to can really work. You can apply non-abrasive toothpaste to your lenses and rub the lenses gently. Then rinse your glasses under warm, running water. At last, the scratches on your glasses lens will be less noticeable.
I think you are referring LENS DOCTOR. it is not as effective as it claims. I have tried it once and the liquid just fills in the scratches temporarily so that they become less visible. After about 15 minutes, it's gone. It may even leave sticky gookum that's hard to get off.
Frankly speaking, I am not familiar with the product you said. However, you can try to use a cotton or soft wool cloth with a little non-abrasive toothpaste to quickly buff away scratches on eye glasses. Rub the lens gently, moving the cloth in small circles. Continue this motion for around ten seconds. Rinse with cold water and wipe dry.