Thanks for all the information,I talked with a member of the Lowell Boat Club on the Merrimac River they claim to use Cameo Aluminum Pot Cleaner which can be bought in Market Basket for around $2 suppose to make them look like new with little effort Ill let you know after I use it boat still in water , thanks again SeaSlayer

Used the Cameo Aluminum Pot Cleaner today along with pressure cleaner and my two 20yr old sons pontoons look like new cameo cost a 1.09 a container similar to a ajax
washed with pressure washer first then sprinkled cameo on a long handle brush scrubbed a little then a p.wash again pontoons looked new boats a 1996 with oversize pontoons well worth the trouble a cheap way out.