The International CBX Owners Association

I need help. I have black spots on my mufflers, both left and right. It was clear nice chrome when I got the bike a year ago, but now, it has this black marks. Can anyone tell me why this is happening and how I can fix it? I think there might be a leak where exhaust leaks out and hit the surface of the muffler where it burns the surface. But what do I know. Please help me solve this puzzle. Thank you in advance for all suggestions.

Looks to me like you're melting your boot/shoes on the muffler.
Autosol and some muscle should remove it. I wouldn't use an abrasive cloth of any sort.
You MIGHT have to use something like GooGone on the black first before the chrome polish.

I’d try an acid clean, with a dilute solution of Ospho or similar phosphoric acid product. Wet a paper towel with it, drape it on the spot, and after 15 min, see if it is dislodged. Or acetone.

That bike is ruined, better sell it before it gets worse.

Boot rubber -- use acetone and non-scratch pads.

I thought so too but I cannot find any issue on my boots.

Do you store the bike on the sidestand? Maybe it’s potting goo from the ignitors.

Oven cleaner and 0000 steel wool, if more mild efforts fail.

Dave