Mr. Clean Magic Eraser works great. 99% isopropyl alcohol on an ME, but I keep a couple of strips of alcohol swabs in my case. The swabs you use to clean the area before you get a needle.
I've cleaned the dirtiest of ferrules for people at the hall with just one swab.
shaving cream or cheap toothpaste, turtle wax polishing compound. magic eraser with water, etc. 2000 grit sandpaper and elbow grease. A little car wax with cleaners. God luck, lots of options. John
a product called "bar keepers friend" is a super cleaner doesnt smell but its works on all kinds of dirt also on sinks and burnt pots its a must to have under the sink great all around cleaner i have used this on dirty linen wraps over the years i believ you can get this at walmart i posted there where to buy link below