When I bought the truck it had a plastic drop in bed liner, while they usually look nice in the truck, the damage they cause underneath can be pretty bad. So, as always I pulled it out and threw it away to reveal years of dirt, leaves, ammo casings, and thankfully a minimum amount of rust.

I've found the the easiest way to clean this out is to spray engine degreaser or a really powerful cleaning agent and let it soak for 10-20 min followed by a pressure washer. Use of a pressure washer reduces the amount of time you spend scrubbing with a brush.
After it's washed out well, take a medium git sand paper or the sanding pad included with the Bedliner kit you bought and go over every surface you want the liner to adhere very well. Making sure there is no dirt stills stuck anywhere, wash out the bed one more time and let dry. Inspect once more, blow out with an air hose if needed and then proceed to mask off the areas you don't want the liner touching.
I find doing one light coat over everything first followed by a second heavy coat works best, use the included brush to get in the corners and the roller should handle the rest. This stuff does NOT come out of clothes and it likes to splatter quite a bit when rolling it on, so don't wear your Sunday best.


If I do it again, I"ll choose the Hurceliner over the Duplicolor armor. I"m not a fan of the roller they send with the Duplicolor, but all in all they both do the job well.