When I've moved in to some negelected trucks in the past I got 2 buckets, 1 with clean water, 1 with detergent water, a small stiff bristle scrub brush, and a hand-help sponge with mop-like "fingers" that absorb really well (all from wal mart)
Simply start in the back in front of the sleeper, wet the floor and scrub well a small area, then "mop" up the dirt and excess water, and continually rinse and wring the sponge, and repeat the process out thru both doors.
Once you get the imbedded grime scrubbed out then use rugs in the center area, and a deep ridged HD rubber mat (as large as will fit) in front of the drivers seat to hold tracked in dirt until you can shake out the mat.
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