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A trick we've often used to clean small tanks is to put some pebbles or marbles in them and give a good shaking to knock any rust, scale or other solids loose .. Shake out the rocks and crud. and have a look. If there's still build up in there, do it again. Finally rinse it out and thoroughly dry. It would be a challenge to cut a tank in half to clean and weld it back together. Unless you're very skilled and the tank isn't too thin you'll make nothing but a useless mess out of it, A welding shop would charge you more than the cost a new tank to do they job if you could even find one to take it on.

That's some clay there...Cool video@JacobSlabach !