Gladisp...gladaspor...green sh!t in your fuel tankmaybe?.
First of all consult the maintenance manual. But of the top of my head....
Drain GALLONS of fuel/water out of the water drains in the tanks. Remove filter, flush engine fuel system through with GALLONS of clean fuel. Put in new filter.
When fueling check for water in the fuel supply and every night drain the fuel drains thoroughly.
I do think though that once you have this stuff in your tanks youv'e got a long haul in front of you, unless you go into the tank and physicaly clean it out.
The above advice is, as I said, is off the top of my head with a few beers inside me so don't quote me!!