polishing

I recently purchased an HK 25 by CompLyfe in the Rose Gold plating from a friend for a hell of a steal. He had the tube sitting around for 7 months or so without using it, I thought it was beautiful and wanted it so we made it happen. Fast forward a couple weeks and I'm noticing an area just...

Ey mates, I just bought an authentic black tomahawk mod and was wondering what i can do to polish it up nicely. Seems like there is a smudge in the black graphite i cant get out with a microfiber wipe also. Need her lookin squeaky clean. Any household items i can use? Prefer not to go buy...