Dawn and Joy, I've heard urban legends about the cleaning power of both. Boaters seem to like Joy.

Me, I like Dr. Bronners.... and Simple Green.

Can you take those instructions in to a paint store (not the paint dept of a big-box store, an actual Paint Store) with the bike and ask for their advice? My dad was manager of a paint store and he was always helping people figure out what kind of paint was on something, and how to get it off.

(maybe call and explain the situation and ask when someone who knows how to help you will be in)