Best way to clean algae?
I just bought a Catalina 22, my first cabin boat. The waterline has algae and dried scum that has been on there quite awhile. I have tried some household cleaners with no luck. The boat is on the trailer on my concrete driveway. What is the best way to get the hull clean again? Is there a way to do it with chemicals purchased locally? I am 3 hours from a West Marine store.
If the best way is with marine cleaners, what do you recommend? Will I need to protect my galvanized trailer? Should I clean the boat in a sling?
After cleaning I am going to paint the bottom with antifouling paint. The bottom of the boat still has some antifouling paint on it and comes clean easily. The waterline area is where the gunk is like concrete.
Thanks in advance!