The ONLY way to remove those scratches is with sandpaper. They are simply to deep to be handled with any 3M pad, regardless of color. Those would only be useful in hairline scratches or to blend a mar. Any polishing (e.g., Flitz) will only do just what it says...polish. Then you will have shiny scratches.
You would need to sand in stages, with the rougher grits (with the rougher grits you can be less careful and sand back and forth as the purpose here is to remove the scratches, not focus on final grain finish) used to take out the scratches and move progressively up to finer grits (then only sand one way, using a block and being careful on the stroke) until you have the finish you desire. Not for the faint at heart, but not a difficult job to do. Have to have patience and perseverance.
You would need to sand in stages, with the rougher grits (with the rougher grits you can be less careful and sand back and forth as the purpose here is to remove the scratches, not focus on final grain finish) used to take out the scratches and move progressively up to finer grits (then only sand one way, using a block and being careful on the stroke) until you have the finish you desire. Not for the faint at heart, but not a difficult job to do. Have to have patience and perseverance.

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