PerfectDuster vs K&N
#2
they dont recommend you using things like that, just lightly tap all the dirt off of the filter (if its real bad) you'll be fine, the dirtier it is, the better it filters. Use the cleaner kit if its REALLLLY BAD, spray on the cleaner and run it under the tap, then wait a day or so for it to dry, DONT force dry it with compressed air or heat, it will shrink the material. then re-oil it following directions. Then let oil sit for a bit and wipe off access, then wait for it to blow your MAF