Denatured alcohol or 90~99% rubbing alcohol. I can't remember which worked best, one of them cuts carbon really well...
I suspect a soaking in Pine-Sol might work too.
Don't even consider anything with lye, like Greased Lighting.
A feeling of having made the same mistake before: Deja Foobar.
"Think about how stupid the average person is. Now, realise that half of them are dumber than that." - George Carlin