How to remove algae from boat hulls?

What did they call the formation of several ships intended to provide protection from submarines in World War 2? How can you get a title to an abandon mobile home? What is one meaning of a single prolonged blast of a horn? Did a pt boat sink a Japanese submarine off the Aleutians? Do knuckles and tikal like each other? How is Micky Arison related to Ted Arison? What color light is the starboard side? How big is ballast tank in submarine? Do boats burn fossil fuels? What is the weight of mercury thunderbolt 800? Where should non essential passengers stand during fueling process? How do you change the impeller on a BF50A Honda outboard? What is the price of mobile homes? What is your passport application status? Why have we been able to build supersonic aircrafts but not supersonic ships? Who is responsible for the safety of the boat and the people onboard ie ensuring all the required equipment is onboard? What cruise lines will take you to ALaska? When were watertight bulkheads invented? Who owns the yacht shergar? Why is tongue weight important to towing your boat?