I have one boat I keep in the water all summer and I have brackish water here also. I run the boat every couple of weeks and then once every 2-3 months I clean the hull (in the water) with toilet bowl cleaner (any cheap one will do). Just don't get it on any stickers because it will remove the shine from the stickers. I had a buddy that had a SEAPRO and he called them to ask what to clean the hull with and they recommended Toilet bowl cleaner.
It does a really good job, I've been using it for 5 years now. I use it on a aluminum boat I have also.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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