There is a product called Alumaprep . One bottle is the cleaner and the other is the prep for painting. Also CRC aluminum pontoon hull cleaner could be used .
A few links to get your head spin .![]()
http://www.aerospace.henkel.com/Imag...odine_1001.pdf
http://www.aircraftspruce.com/catalo...umprepaint.php
http://archives.glastar.org/0006/msg00270.html