The only way to really remove the scratch is to have your car professionally machine buffed with abrasive compounds and polishes. This procedure is both expensive and dangerous. Just contact a local body/paint shop for those details. As jungathart pointed out you can do more harm than good. If you try this yourself don't use anything ruff.
Try this wheel polish with a buffing machine but I'm not sure it will work if they are deep as sanding is needed and refinishing. I hate to give you bad news but a "Do-it-yourself" job will be tuff. I wish you the best and please keep us informed on the project. Again, welcome to the community, it is a great place to be.
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http://www.meguiars.com/store_megui...tore=meg&line=marine&catagory=2&subcatagory=2
All Metal Polish
Just a dab of this safe and gentle product will clean, shine and protect any type of metal including stainless steel, gold and silver. Tarnish, rust, oxidation and corrosion wipe away without scratching the surface.
M-2805 ....................5 oz. $8.98