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MB3 155a: Steel Wool and Sandpaper on Shabbos (323:8-10)
Nullifying an issur on Shabbos is considered מכה בפטיש and is generally asur. Scrubbing silver or other utensils with an abrasive substance (e.g. sandpaper). Can one use steel wool on Shabbos?
Scrubbing utensils with salt.