As Heraclid mentioned there was much sand to be had at the recent Florida Meet. One particular image from the video of -x- and VX1 chasing each other through sugarsand while throwing multiple rooster-tails comes to mind! I've had mine out in the local groves with DEEP LOOSE sugarsand with no problems. With my Trooper RS and BFG MudTerrains I would occassionaly have to hit 4-low, but not so in the same stuff on TOD and stock Duelers.
Afterwards though, I would hit the underside with a good garden sprayer rather than a pressure wash so you don't force the grit further into where it doesn't need to be. All you need from the water is VOLUME, not PRESSURE.
Enjoy and be sure to post pics!