Tried many different sponges.. they dont do it for me.  One word.  SHAMWOW!  I bought a 10 pack at BJs about 10 years ago.  Still have a few unused ones.  I find that they hold more water than a sponge.... they clean the debris from the bottom better than a sponge.. they clean the muck off your feet better than a sponge.... AND after a good rinse in the lake, they pull duty as a camp towel.  Bright orange, I have also tied one to a tree next to the privy as a high vis marker for those late night trips in the dark.  I cut a thin strip off one edge and used the material to sew on hanging loops.
oh, the dog has a dedicated shamwow too.
Jason
				
			oh, the dog has a dedicated shamwow too.
Jason