WD-40 would help it move around better. Try Rubbing alcohol too. But thats just to let it slide better. I'm not sure why you would need a concealed part of the clamp to be nice and shiny. As long as it works it doesnt seem like a big problem. Just send it back and get new clamps.
Racquet : TGK238.1 2X / Head YTPP 1X
Strings : BHB7 17G 49lb / LUX 4g Rough 17G