go to this site, cleaning your toon will be a breeze the hard part is getting the old bones under the toon to wash in insides. Should take more than an hour
Pump sprayer and hose is all you need.
I do mine every year, it's gets really black sitting outside under the trees. I've washed mine 3 times and still have all most a half gallon.
Pontoon Cleaner, Aluminum Brightener, Acids, Degreasers, Socar Chemical