Honestly, let's face it. That hull is ruined, you'll never get it back to pure white. You can wetsand and polish all you want, the hull is toast. I've seen it time after time, that kind of calcification is pretty bad.

I know it sucks to hear that kind of news, especially on that kind of boat. The reality is, it will spread like cancer and destroy your whole boat. It's time to put it down. I know it will be hard, so I'll come and do it for you. Just leave me the keys, and I'll take it off your hands so you don't have to suffer.