Rust dust in gas tank

[wrndln]

This may have been covered before, but I don't know. The gas tank in the car I am restoring, a 29 phaeton, has been empty for a long time. The gas tank is in the car and painted. When I removed the shutoff valve on the bottom of the tank, there was some rust dust on the top of the valve that was inside the empty tank. I believe the tank is probably OK, with no leaks. I am now trying to figure out how to remove rust dust that is undoubtedly in the bottom of the tank. I could just put an inline gas filter on the gas line from the sediment bowl and the carburetor and change it when it fills up with rust particles after putting gas in the tank and running the engine. However, I would rather get the rust dust out before putting gas in the tank. If anyone has suggestions on how to remove most or all the rust dust, please post a response.
Thanks