LOL.. I cleaned mine with a razor blade.
Scraped off all the carbon build up, then with a small wire brush, rag soaked in brake cleaner, and a can of brake cleaner, I sprayed and wiped it down till it was like new!
It won't harm the electronics. Just don't soak the electrical part in any of the above mentioned solvents.
MDC, you're not crazy! I saved a pair of vise grips with Coke once!