Cleaning the Waterline While in the Water

[sailorboy1]

OK I give! Wants the best thing to use to clean the boat's water line while it is the water? Mine started it's own little sea garden on one side. So I went at it with a soft briste brush to no effect. Then took a plastic scrapper to it that did a good job of taking off the "weeds" but left a nice "dirt" layer on the hull. Tried to get at the dirt with a sponge using the rough side.This didn't seem to do much but maybe I didn't "go at it" hard enough. Is there a special cleaner or magic trick to this?

It's always the simple looking things that piss you off!!

[Cheechako]

I used to have a favorite "brush" that was really a plastic handle with coarse (scotchbrite" type of stuff on it. Worked great. Maybe just a big patch of coarse scotchbrite....? yea, that slimy grass stuff comes off real hard....