I have the same amp but have only cleaned with the stainless cleaner my wife uses on kitchen appliances with good results. You may want to consider automotive metal polish (non abrasive). It works incredibly well without scratching.
McIntosh MA352 Mirror Finish Scratches
Hello,
I have a McIntosh MA352 and used some Eagles Never Dull on the mirror finish to clean it. Long story short, it left some tiny swirl marks/scratches on the finish. I reached out to McIntosh over a month ago and followed up with no luck. Has anyone had any luck with a polish or a way to get these out? Thanks for your help!
-Will