LOL! yep been there. after a day of mudding in the swamps I used to lay under mine with a hose and brass 1/4" cone nozzle to wash all the mud out of the frame and off the drivetrain. be sure to wear a dive mask or goggles under there pressure washing.
I used a steam cleaner when I had the trans/range box on a trans jack and the xfer got it while on a floor jack.
it is a little bit of work to R&R the trans/xfer but a good HD trans jack along with a floor jack & solid slab to work on it can be done in a day.
I always hated R&R of the xfer shifter and mount bracket and it was always HEAVY WORK!