As AP said, then use a full tank of PULP (Caltex Vortex), a long stretch of highway, and stretch the legs..........
I do this often (sometimes to often) to keep the beast clean and mean.
FORD BA FAIRMONT GHIA DRIVER
5.4 litre VCT V8, SSS AUTO, HERRODS EXHAUST, MERCURY SILVER
, BLACK LEATHER/INTERIOR, TINTS, SUNROOF, SAT NAV, FORD SCUFF PLATES, GHIA MATS, PREMIUM SOUND, SLIMLINE WEATHER SHIELDS, BONNET PROTECTOR, TOW BAR, BLAH BLAH.......