Which type of Scotch Guard pads can I use to remove these scratches? Appreciate your help.

I'm using 3M General Purpose Super Fine, which is gray in color.

It matters how and which direction you stroke, so proceed lightly and carefully until you catch on. Works really well...

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Uvidíme se později, aligátore.

I use the very fine gray 3M pads as well and they work very well for a final finish. If you have deeper scratches that the 3m pads won't take out, use sandpaper first. I'd start with 320 grit first and adjust up or down accordingly. When the scratches are gone, then use the 3M pad for the final finish. Of course when refinishing a gun, ALWAYS go with the grain iof the metal.

I also remove the cylinder and grips first - make it much easier to work on. If extensive sanding is required then I disassemble the entire gun - it will be cleaned and properly lubed before reassembly. You don't want sanding dust and grit inside!

Scratches tell a story about long use. I like these scratches.

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Come and take it!!

Grain? What grain? How does one detect the direction of any grain?

You want to go lengthwise of the barrel, cylinder and the frame, not crosswise. Think long direction rather than short. If you have to resort to wet or dry paper for scratches that Scotch-brite won't remove be sure to use a sanding block, I use WD-40 to lubricate the wet or dry paper. I use an Art gum eraser as a sanding block,when done with the wet or dry polishing and are satisfied the deeper scratches have been removed then you can use the grey Scotch-brite. For final finish I use a dab of Simichrome or Flitz on the Scotch-brite. Wipe off with a microfiber cloth and wax with Ren wax polishing with microfiber cloth.

To touch up scratches or wear on the sandblasted receiver/barrel top take a small piece of 240 grit paper and tap with a small brass rod or hammer. A woodpecker like tapping is what will blend the sandblast finished surfaces.

Would a Scotch Brite pad work on the cylinder turn ring?

You can remove the cylinder turn line with a Scotchbrite pad, but as soon as you close the cylinder and pull the trigger, the turn line will begin again. Even from the factory, there is at least a faint turn line as the action must be cycled during the fitting process and test firing.

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VCDL, GOA, NRA

I also use gray and green scotch-brite pads but keep them wet with oil while working the pads. The oil seems to smooth out the lines from the pads.

This.
I live with the scratches and wear.

Since "gun scratching gnomes" are at work multiplying scratches in my safe I decided to leave the scratches as battle scars.