To summarize Baykeeper's advice:
1. Use your boat less (a long term goal for these people....)
2. Don't clean it in the water. Haul it out. They suggest KKMI, which is by far the most expensive boatyard in the SF Bay. (That way, you'll have less $$ to spend on fuel later....)
3. Don't use soap--use only an oil pad to remove the oil from your boat. (They mention that using soap to disperse an oil sheen is illegal, which it is. Using soap to clean your boat is not, by itself, illegal.)
4. Oil bad--don't touch.
BTG