I have had issues shipping saws to the USA. I forget witch shipper said if it has had gas in it they wont take it.
So now I drain the oil tank, put some alcohol in it, run it for a bit to pump alcohol out the oiler, then flush the oiler tank a few times.
Then I drain the fuel tank, rinse once with alcohol, put a bit more in the tanks and start the saw for 10-15 seconds, drain the tank, start saw again till runs out,,now I let the tanks air for a few days with caps removed,,sometime blow them out with air,,, no smells left, everbodys happy. A pain in the butt,,, I tell the buyer to put a few drops of oil down the cylinder before starting,, just in case.
BBB