a 'scouring' pad/cleanser [=a pad/cleanser that is used to scour something]
The river's banks had been 'scoured' [='eroded'] by floodwaters.
We 'scoured' the woods for the missing child.
(..) You've seen the Night King. He's coming for us. For all of us. Okay, come on. Let's get them inside. I want every northern maester to scour their records for any mention of dragonglass. Dragonglass kills white walkers. It's more valuable to us now than gold. We need to find it, we need to mine it, (..)2017 TvShow: Game of Thrones Title: Dragonstone Season: 7 Episode 1