Been cleaning what I can of the fuel system but have found that the fuel tank is unbelievably dirty. Is there anything you'd recommend to clean out the insides of a late 80's fuel tank?

*Not look for an additive to add to the fuel, looking for a cleaner to remove as much grime, dirt, etc. as possible prior to loading the 240 w/ fuel.*

 

Try using fuel. If you have the tank out you can use anything as long as you rinse and dry it good.