K&N 99-6000 refresher kit is for washable cabin air filters. It 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 mould, 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 odours and it is made from safe, biodegradable ingredients.