Hey, I’m actually a Stainless fabricator and a lot of our work is kitchens for schools etc.
If you’ve got a lot of scratches you can try to remove them with a flapwheel mop (the type you mount in a drill), we use 40 grit to 120 grit and can usually get a good match for most of the grain patterns used. These are fine for small areas otherwise we’d use a larger brushing tool.
If it just needs a going-over, then buy a roll of scotch-brite, (the dark red is probably best), mount it on a length of 4×1-ish wood about 600mm long, you can then use this to match the grain along your tops. The length of the piece of wood keeps the grain going in the same direction. Small discrepencies WILL show up!
Nay kind of non-toxic oil like baby oil or Olive oil can be used to protect it after, it also acts as a lacquer and dulls the finish slightly.
I hope this makes some sense anyway!