Thats exactly what we use to do back in the day. We didn't have much besides mud to play in back where I'm from. Just slide the sprinkler up under the truck and let it run overnight. Then the next day hit the car wash.If you have access to a sprinkler, I would just let it run under your truck for awhile, there's probably mud in places you don't want it anyway, start at the front and move to the back, probably an hour at a time to let the water soak in. Or go drive into a lake and let it soak half way up the wheels.