Also, get accustomed to charging by the foot, instead of the job as a whole, or by the hour. If you charge by the hour, you'll either end up being put on a time deadline, or have some very angry clients when the total comes out to be exponentially higher.
I charge $5/foot for a wash and quick brightwork cleaning, when you start getting into waxing, it goes up to about $10/foot, and compounding/buffing ranges anywhere from $18-25/foot. All of those prices are for up to 65' yachts. After that, they go up about $3/foot across the board, and then over 110', I work with the client to get an agreed price. One of my clients in FL was the son of the Geico Insurance creator, and his boat was 177'. It took 12 hours just to wash it. I buffed out the entire thing, when it was out of the water. 11 days later, I had a NICE check in hand.