Fuel Moto BMF air filter elements feature a unique dry fiber style media that is different than cotton gauze type filters. The dry media does not use any oil and can be easily cleaned with warm water and dishwashing soap. For heavy debris you can use a mild degreaser along with warm water & dish soap, thoroughly rinse the element with clean water. Do not brush the filter, do not use compressed air, and allow the filter to air try. DO NOT OIL THE BMF FILTER ELEMENT. See video below for more info