Black residue on back of a Four-Twenty AC

Gerald

New Member
Mar 22, 2005
1
Kaplan, La
Every time I take my boat for a spin, I have the problem of cleaning this black residue on the back of my boat. I have twin 450 Cummins on my boat and when starting or running there is no visible black smoke coming from the exhausts.

First I would like to find a way of preventing this from happening. If there is no way of doing this, is there a easy way of removing this residue without harming the gel coat or removing the wax on the fiberglass?
 
Black residue

Hello. It has been my experience with most boats I have owned with a swim platform either diesel or gas of black streaking occurring above the outdrives. This has usually been because of the exhaust fumes. I have used a good quality boat hull cleaner from any westmarine or boaters world. If that does not work, I have also used a specialty product - black streak remover (not really meant for this type of streak but it works). Hope that helps some.
 

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