I noticed a few of those also after I picked up some bagged paver base from Lowes. The color of the scratches almost look blueish. Have not tried any cleaner to take them off other than spit shine.:grin:
I know EXACTLY what you mean ! as I have a couples too from start and just lived with it...like a stain that won't come off... like bleach spots on clothes...:|:surprise:
You did not mention the model year. Taking the 2017 into consideration, there a 3 different types of composite materials. The years model before 2017 were very easy to scuff. Sometime around 2012 or so they changed the composite material slightly but still scuffs. I have had 06, 08, and 13, they all will scuff and leave white marks. Just sliding a cardboard box on the surface will leave white scuff marks. I always wash the bed with soap and water when cleaning up the truck. After the bed drys, I wipe it down with Armourall. Works for me, looks like new.
Hmmmm...doesn't everything look new when you apply armor all on it, but then after a while it wears off and goes back to how it looked. They really show replace the panels if it's obvious.The detail shop at the dealer used some super strength Armor All type product. Spent an hour on it, and it looks perfect now.