K&N makes a good air filter cleaning solution that will get that oil out. Let it soak then use a garden hose to rinse it out. I've had that oil puking several times in my filter. It's good to occasionally clean the filter anyway.
K&N 99-0621 Air Filter Cleaner and Degreaser - 32 oz. Trigger Sprayer (through Amazon)
2010 RHS Tri-Glide Ultra, Fuelmoto stainless headpipe, Supertrapp SE slip-ons, SE255 cams w/S&S lifters and TTS2 tuned by Docs Performance, Lenale parade fan, UltraCool Reefer oil cooler, ClutchWiz, Barnett+1 clutch pack. Hayden chain tensioner, crotch-cooler shields, Wild1 WO575 chubbies, Road Zeppelin air seat, 30t. primary belt pulley, Lyndall rear ceramic/aluminum rotors w/L. pads rear and front, Garmin Road Tech 660 w/radio interface, 1.25" lift brackets