You can get this stuff at any of the parts stores. Advance I know off hand has it all.
You might want to just buy a 6 pack for someone with a orbital buffer. I tried to polish out my scratch by hand and it just didn’t work real well. It was light too. Didn’t go through the clear, couldn’t fingernail it.
EDIT: Advance has cleaners & clay bars, polish. I don’t know if they have the more specific stuff that Jesse’s talking about.