Windfall, Do not add dawn soap to the water. Just hot water with a tank heater keeping it at 85-90 degrees. It will be clean in 9-12 days. I don't scrape on them or anything like that after I pull them out. The maceration basically dissolves it all. Now that said, I don't put unskinned heads in the water. But I still think what you have will rot off.
Tank heaters are $13 delivered on Amazon.
