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Using a fine-grit sanding sponge is considered the best method for sanding joint compound due to its ability to provide a smooth finish while minimizing dust and potential damage to the surrounding surfaces. The fine grit allows for more controlled sanding, which helps achieve a feathered edge that blends seamlessly with the drywall.

Sanding sponges are also easy to maneuver, especially in tighter spaces, making it easier to work around angles and corners without compromising the integrity of the joint compound or the drywall. This method allows for refinements to be made without over-sanding and creating deep grooves that would require additional compound application.

In contrast, other methods like power sanders or orbital sanders can remove compound too aggressively, leading to uneven surfaces or even damage to the drywall itself. Steel wool might be too abrasive for joint compound, risking unintended scratching or rough spots rather than providing a smooth finish. Thus, when aiming for a quality, professional finish on joint compound, a fine-grit sanding sponge is the superior choice.