Have you tried Simple Green with a brush after letting it sit a bit. Then you can finish it off with Back to Black or Forever Black once it is clean.
2009 JK Wrangler X, Hard & Soft Tops, Detonator Yellow
Pioneer BT-3300, Polk Audio DB Speakers, Ipod Cable
Mopar Grab Handles, Mopar Slush Mats, Viper 5902,
Wet Okoles, KC Hi-Lites Aux lamps, Cargo Mat,
Safari Doors, Bestop Duster, Windjammer, and Bikini Top.