Every 10 days or so, clean your filter equal parts white vinegar and warm water. Let the filter soak in the solution for an hour, then simply squeeze it dry before using.

They may be merely additions to existing product lines (the first cigarette with a filter tip, for instance) or improvements to existing products (a new whiter-than-white washing powder).

If black and white is too extreme for you, you can also try Photoshop's Photo filter tool and adding color tints.