As a Piano Tuner, I reported to my wife a call from a disgruntled owner who complained that her piano was “ringing”. My wife chuckled and asked “Did you tell her to answer it?” Piano Sheet Music
When washing the bottom pay special attention to the rudder as it seems to attract the most sea life and grim. After pressure washing it may also be a good idea to add a cleaner and then use a scrub brush to thoroughly clean the rudder. Using a rotating scrub brush attachment will help get rid of all extra dirt and debris. From marine paint guide.