you will need more than just chrome polish to get them out , depending how deep they are. What you can try is going to your favorite auto paint store & get some aggresive rubbing compound & some sort of buffing wheel to put on your drill or better yet if you have a buffer use it , you need to build some heat to get them out . Try ( eastwood .com ) for metal polishing supplies & some tips. Larry
You need to find a chemical way to remove them, as any mechanical method will dull or discolor the chrome. There is a impregnated wadding like NevrDull called X-treem that is pink in color and comes in a can the same size as NevrDull that is black with yellow and red writing. Works for me.
If it is real stubborn you can use a towel with acetone or even better trichloretylene.
My sometimes co-conspirator has the X-treem stuff at his shop. Broadway and Alma school, NE corner, hidden from the street, ask for TJ.
> Assuming it is some molten boot sole or something.
I've never had trouble getting melted shoe off of my pipes, usually just wait 'til they cool and rub with my thumb (skin, not nail). Of course my pipes are black, not chrome. Hard to believe that sole would stick that much better to chrome, if so I'm kinda glad my pipes are black because I am sloppy about foot placement ... ;-)
I melted just about half of my boot on my exhaust pipe and I used a product called Mothers Chrome Cream to get it off. Now everytime I get melted boot on my exhaust I just pull out the Mothers Chrome Cream.
i have recently had a microfiber rag touch my hot header pipes and kinda melt on there. a smart man told me to try wet, real wet steel wool (i used 0000) and it came right off. cost about 3 bucks for a ton of it at the hardware store .