Two treatments with gravel and solvent (Goof Off). Last time I dried the tank in the sun - this time it was later in the day so I used a shop vacuum in reverse (exhaust port). Works well.
Still no sign of leaking.
So now you can see the inside of the tank. Do you think a soak in vinegar will clean it up such that it will be able to be used as is? I really don't want to seal the tank if i don't have to.
Still waiting for carb parts order.
This is just the stuff that came out before even treating the tank.
First rinse contents including stones.
Dark spot is still wet - another 20 minutes of blower vac and it was all dry. (edit) Looks like the surface if the moon in there.