Well Cotton it maybe... It has been a while since I bought it and I Only looked at it for a second last weekend. I have TONS of the K&N oil so no need for that and I just thought maybe be by some crazy chance someone here would have a little input on how they clean theres other than the K&N magic fluid which is not avalible at any store near me... Ok Off to the Suzuki Dealer on my lunch Hour Tomorrow at work for what maybe just dish soap.