What is the purpose of this.... why should I clean this if I can Buy a new filter, isn't that better??

Easy... Rockafella. Why buy a new filter if you can clean and oil the old filter and save some money. Once you go through the cleaning steps (very simple) your filter will be like new. Hey spend the money you save on some other High Quality Injen Items.

How do I clean a filter??

Air flow test have proven that cotton-gauze filters flow much more air than paper element filters do. However, when they get dirty, they can clog up and limit air flow. This is one reason why you should clean your air filter with Injen's filter cleaner kit. The kit contains Injen's filter cleaner that loosens and removes dirt trapping capabilities. Injen's filter oil contains a red dye to easily see where the oil has saturated into the filter, eliminating the common mistake of over oiling the filter. The oil helps maintain your filter element from breaking down. The experts at Injen specifically designed this oil to be safe for your intake system. When used correctly, Injen's filter cleaner kit can maintain the life and performance of your Injen high-flow filter and Cool Flow air intake system.Injen Pro Tech Charger Kit for all Injen RS Race Division, RD Race Division, Short Ram and E Series Air Intake Filter

How much oil should i use to re-oil my filter after it is clean??

Surgical cotton air filters are extremely absorbent and will not require significant amounts of oil. Keep in mind very little oil goes a long way. Using a small bead of oil, run the bead up and down the filter pleat allowing time for the filter to absorb the oil and act as a wick. If after 10-15 minutes the filter has areas that look gray, add a small amount of oil in the gray or un-oiled area only. Never over oil an air filter.

Can I use other cleaning agents besides the Injen cleaner and oil??

We highly recommend that you only use Injen Technology oil and cleaner. Injen Technology air filter is a specific mineral oil blended with special polymers to form a very efficient tack barrier. Standard petroleum products such as transmission fluid and motor oil will soften and destroy the filter bonding agents and sealed edges. Injen cleaner is a non-detergent degreaser. Solvents, gasoline and various house hold chemicals will harden the rubber seals causing the filter to distort and may affect the ability of cotton fibers to function properly. A mild detergent can be used in an emergency situation, but care should be taken to fully rinse and remove the soap. Removing soap from the filter can be extremely difficult or time consuming.