I have the Duraliner on my bed, and I haul boxes upon boxes, and the grooves are covered by cardboard fibers. I don't want to hose it because I have a campershell and it is lined with fabric. Do I need to remove the shell? Besides, I am thinking of using Herculiner later on. The shell is heavy, maybe about three hundred pounds, and there is a wire for the brakelight, which I don't want to mess with.

Leo dC

 

A shop broom would probably work. Or you could try a vacuum cleaner.
I have RhinoLiner with no cap, so I just hose mine down when it needs it.
Good Luck.