Do not use compressed air on the ITG filters!! It directly states not to as it can damage the delicate foam. SImply wash it with a mild soap and water my squeezing it several times. then get a fresh bucket of just water and squeeze out the filter several times to get all of the soap out. Then let it AIRDRY for several hours depending on how hot it is out. Then apply a light coat of the itg oil and work it into the foam. DO NOT USE ANY OTHER FILTER OIL(k&n oil)!!! IT WILL BREAK DOWN THE FOAM AND CAUSE DAMAGE TO YOUR MOTOR!!!