Stainless Steel Chainplates Wire Wheeled
Like Jeff H says, if it was a steel wire wheel, it is a major no-no. Carbon/iron contamination of the stainless results. Within short order in marine conditions, the nice shiny stainless steel will look like a rust hued piece of neglected steel. On top of that, the contamination promotes stress crack corrosion in the area of weldments.
You can reduce this contamination by the methods Jeff mentioned, but all grinding or polishing activities will encapsulate some of the contamination particles and allow them to re-emerge at a later time.
No steel cup brushes/wheels, saw blades or even non-ferrous grinding or cut-off wheels that have been used on carbon steels allowed near stainless!! If you must, stainless cup brushes (never used on carbon steel), bronze wool or scotch brite.
I hesitate to suggest this, but a rinse with mild nitric acid may get some of that carbon contamination out. You must be careful of yourself, surrounding aluminum items and fiberglass (in that order) when attempting this. It will turn the Stainless black, and you will be back to Jeff''s plan to get the shine back.
Hope this helps,