I've used Resolve Carpet cleaner and a moist rag on mine. It works pretty darn good!
2004 RYP S2000
Apexi VAFCII, K&N FIPK, Carbon Fiber Cooling Plate, PLM header, Berk HFC, Tanabe Medalion Touring exhaust, Swift Spec-R springs, Black Enkei RPF1's, 17x8/17x9, Dunlop Star Spec tires and black Work lugs.-220 tuned RWHP
2012 GM 370Z Touring/Sport w/Navi
K&N Typhoon intakes, Swift Spec-R springs, 20mm spacers all around
2010 CBP RDX