I purchased a new Derby cover and replaced the factory one today. I had a small amount of oil drip while changing it. I used some multipurpose cleaner to remove it but I still see the spots. I have an 05 Standard with the stock primary cover which is an unpolished metal surface. Any recommendations would be helpful.

 

You might be able to use brake cleaner aerosol spray available at auto parts stores etc. That stuff is basically dry cleaning fluid. I use it on the garage floor when I get some oooppps. Try putting a drop of oil on an inconspicius location on the enging block (underneath maybe), spray a little cleaner on a rag and blot it up. If it works there, then try the primary cover.

 

Your primary is not unpollished alum. but gray powder coat. Your valve covers, ect. are pollished alum. and the gray powder coat will stain easly. I have a 04 FXST and had the same problem with powder coat staining as you. Bad news: If it stains deep it is there for good. Light stains can be buffed out with a quality scratch remover. I use Scratch x avalable at Wal Mart. Be carefull or you will take off to much and make it worse. Best thing is to keep stains from getting there to start with. To do that I use Honda spray pollish. I know that sounds sacraligous but it works . Spray engine down about every 2 weeks or after rain and it still looks new after 24000 miles. Wipe any grease or other spots as soon as you can with it. The dye in high octain gas that we burn will stain in a matter of minents so get it off emedeantly.

 

That has a clear coat on it, don't use anything abrasive to remove spots.