The amazing cleaning ability of the Glass Cleaner 400 removes stubborn glass stains like oily dirt and dry/sticky bird droppings. The rinse aid product leaves no marks, streaks, or glare. The anti-fogging agent achieves long-lasting transparency. You can use this product on the inner side of windows as well in order to remove tar or oily dirt. The bubbly solution allows for easy use, non-messy use because there is no need to worry about liquid splashing around.