Hondax
Nitrous
I use just a straight edge razor blade on cold pipes and most of the hard stuff will come off. Finish with chrome polish and good as new. My shoe also cooks on the old Bonney pipe next to the shifter and that system works for me. BE REAL CAREFUL WHEN SCRAPING THE RUBBER!!!!!!!!
It seems over time, the melted shoe sole would wear off, kind of like cooking juices do after running an oven on "self clean".
Acetone should dissolve the burned shoe sole and leave the chrome alone but I can't swear to it.