Interesting, I had perused this thread this morning. This very night when I removed my Allen-Edmonds Kingsleys, I saw to my horror that I had a huge wad of blue-green gum affixed to the sole of one shoe. This is the second time in the recent past that I have stepped in gum with an almost-new leather-soled A-E. I was insane with rage. I bellowed so violently I even terrified my ferocious Japanese fighting dog. Gum chewing is detestable at best. As for people who spit gum onto streets, if they are very small children, they should be beaten within an inch of their life to teach them a good lesson. If they have attained the age of reason, they should be terminated with extreme prejudice.
Anyway, I scraped most of the gum off with a dull knife. I then used paper towels soaked in rubbing alcohol to remove the rest. Paper towels are fairly abrasive, and using the wet and dry paper towels I got the rest of the horrid stuff off without too much difficulty. I then rubbed A-E leather conditioner on the afflicted area to offset the leaching effect of the alcohol. The sole was restored virtually to its prior state.