Fuel tank cleaning part deux

[copout]

Well, cut out a new hatch to access tank below the floor.
Wasn't surprized with what I found once I opened the tank!
Going to let some alchonox/water mixture sit overnight & then start the cleaning process tomorrow.
If all else fails I will abandon the tank with foam but I gotta give it a shot. This tank will give me approx 30 extra gals. BAHAMAS!
Suggestions are welcomed as to the cleaning process.
I think I'm safe with using the pressure washer now as most odors are gone.
I might even consider dry ice to the inert the tank like we used to do for tank pulls years ago.