K&N’s Refresher kit for washable cabin air filters comes with a 12 ounce pump spray bottle of cabin filter cleaner, an 8 ounce pump spray bottle of cabin air filter Refresher and complete cleaning instructions. The cleaner loosens dirt and road grime from your K&N cabin air filter and helps remove trapped mold, mildew, fungus, allergens, bacteria and other debris from it. K&N’s cabin air filter refresher increases the electrostatic properties of the cabin air filter helping it to trap contaminants. This long lasting formula helps eliminate the source of most odors and it is made from safe, biodegradable ingredients.