Fill the bucket with warm water and a few squirts of dish detergent. Soak the sponge in the soapy water and wring out excess water; the sponge shouldn’t be dripping, but just wet.
Gently rub at the scuff marks using circular strokes. Wipe the area dry with a clean, soft towel. If the scuff marks remain, rinse your sponge so you can proceed to other methods.
Mix a few tablespoons of baking soda with a similar amount of water to create a paste. Apply this paste to the clean, damp sponge and rub at the marked area with the paste. You also can use non-gel toothpaste, which has a similar texture to baking soda paste. Use a paste-free section of the sponge to remove any paste and examine the wall area for remaining scuff marks.
Wet the melamine sponge and gently dab at the scuff marks. Use a light touch with the melamine, which can rub off pigment and paint if used too forcefully.