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WW is guiding you right - and anyone who is a friend of MMO is a friend of mine.
Drain the tank - That gas sludge is just no good. Do whatever you have to do - just pour as much of that crap out of the tank as possible. Your goal is not a pristine tank inner surface, but at least one that isn't flaking and sending varnish deep into the carb.
If you can find one, buy or create a new petcock gasket and remove the petcock as well to do the job right.
Drain any fluid that is in there and then pick your poison as far as flushing the tank. Gasoline and a washcloth will do a lot of good. You can also mix up a solution of kerosene and any carb cleaner that you like. (With the kerosene solution, keep the petcock on, seal the gas cap, and shake your tank like a giant gear-head martini mixer. Then pop both openings, drain and repeat until what comes out is pretty clean.
Kerosene isn't nearly as explosive as gasoline, yet after you're all done, the kerosene that is left in the tank won't damage in any way your new tank of gas and you won't have to worry about the two not being compatible.
I've also used a pressure washer on old tanks with good results. Again, it's better with two openings, one for an inlet and one for an outlet. Don't use full pressure or keep the stream in one place the whole time.
Anyway - your goal is just to remove the gunk and then get new gas into the tank as soon as possible to keep any more surface gunk from building up.
And then, going forward, use 1oz of Marvel Mystery Oil in every tank to start building up a thin coating of oil to stop whatever metal breakdown is happening inside your tank.
The inline fuel filter is a must on this bike and will help keep your new carb as clean as you are about to get it.
You can do this, man. It's no big thing. You're only a couple of hours away from a running bike again.
Keep up the good work.
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