K N?s four-step air filter maintenance system is designed to clean any K N oiled cotton air filter?removing contaminants and build-up in order to help restore filter performance. POWER KLEEN industrial strength degreaser helps dissolve dirt, old filter oil, and other filter-clogging particulates, allowing them to be rinsed away easily with water. Please see complete instructions on the bottle. CLEANS ALL OILED KN AIR FILTERS RESTORES PERFORMANCE Helps restore your filter to exceptional performance by removing filterclogging buildup INCLUDES POWER KLEEN A powerful, highly effective degreaser that quickly dissolves filter buildup and old oil, allowing filter grime to be rinsed away with water INCLUDES KN RED FILTER OIL KN red filter oil remains suspended in the pleats of the cotton filter material of HighFlow Air Filters, allowing for exceptional contaminant capture CLEANING STEPS Spray on Power Kleen, Rinse with water, Allow filter to dry, Apply fresh filter oil RENEWED EFFICIENCY Restores air flow efficiency so your KN air filter performs like new