What a fun little bike! I have now had two 'working tricks' I tried this year that I have heard about but discounted because I could not imagine they would work good. First was electrically removing rust from the tank, which worked like magic. The newest one was yesterday...
I got a new tire on the front rim of the KE100. I did not clean all the rust (a fair amount) off before taking it in but did hit one spot with SemiChrome. Looked like it would be a lot of work and elbow grease. Remembered hearing about using a small piece of aluminum foil with just a bit of water to rub the rust off and polish. Does not scratch the chrome like steel wool or scotchbrite pads. Thought "What the heck, the other thing worked". Well, it works AMAZING!
I probably have YEARS of rubbing rust off of chrome over the years with all the time I have spent rubbing, scratching, scraping the stuff off.
With the aluminum foil it just,,, rubs off. Crazy. It actually works. Just a touch of water. I used heavy duty foil and folded up a piece to make a 'finger' square's worth then dipped it in water and went to work. The process involves transfer of electrons and aluminum oxide but all I care about is that it works. Science IS cool though!