Nasty looking shaft, but why the clean prop and strut?
Watched Summerfield's in Ft. Lauderdale haul a older 45 ft. motor yacht a few years back. Seem that the boat had been kept on a canal behind the owner's home for many years and he had finally decided to sell it.
The entire bottom of the boat looked like your prop shaft, except worse, with clumps of oysters hanging down like grapes. It took them over a week to get the bottom clean enough so they could paint it. Then, to top it off, the guy complained about how much the cleaning cost and refused to pay his bill. Summerfield's slapped a lien against the boat and eventually got paid.
Some people just don't deserve to own a nice boat.