One of the recommendations when using ANY non-fabric materials is to line the filter on both sides with a cotton fabric. This is to keep you from inhaling stray fibers. I would be careful about any products that have chemicals or scents embedded in them. Using a scented Swiffer around the house to dust may be perfectly safe, but you’ll get a pretty hefty dose of the fragrances and any other chemicals into your lungs if you use them as mask filters. Always remember that the safety of any chemical is a function of how much you are being exposed to and the route of exposure.