Rub harshly (5)
(Other definitions for grate that I've seen before include "Grind (teeth)" , "Firebasket" , "Grind, rasp" , "Shred - jar" , "Irritate - rasp - fireplace" .)
(Other definitions for scrape that I've seen before include "Use last remaining resource - . . . . . . the barrel" , "Recaps about predicament" , "Abrasion or mischievous escapade" , "Make clean or smooth by passing hard edge across" , "hole" .)