[Opening the door to Rarity's room, Twilight looks around with a thoughtful frown.]
Okay, we need something porous enough that water will go right through it, but that will still trap sand nicely. And it has to be something she's not going to use for something important. A scrap, if we can find one. Look for something that's already been cut but doesn't seem to be in any recognizable shape.
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[Opening the door to Rarity's room, Twilight looks around with a thoughtful frown.]
Okay, we need something porous enough that water will go right through it, but that will still trap sand nicely. And it has to be something she's not going to use for something important. A scrap, if we can find one. Look for something that's already been cut but doesn't seem to be in any recognizable shape.