Like Rich says, good old common sense. Inspection with a sun mirror thru the sender hole to see how bad and then knock it all loose and try to get it to come out. Soap and water at first. Use all above from Rich or 1 foot long chain.........anything that will scrub and can be retrieved. Chances are there are baffles in there which makes it very hard to clean without chemicals. A Carryall gas tank is rare and worth saving. The max option is cut it open to clean and weld/braze shut. Without blowing up.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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