This is an after-picture after using 800 grit sandpaper.

Could power tools be too powerful as oppose to using very fine sand paper.

What’s a rouge?

Actually, that’s a great idea. I’m going to draw some penises instead.

Any suggestions if it’s not a surface stain?

If it’s soft plastic (acrylic), what could I do instead?

How can I find out?

Should I lightly sandpaper it with a very fine sandpaper?