You could run the engine with the fuel tap in the off position, until it won't run anymore .
Remove the carb bowls empty any remaining fuel and sediment, re-install bowls .
Remove fuel tank drain the remaining bit of fuel out of it, if you have a single fuel tap fuel tank, about half a gallon of fuel still resides in the tank if you empty it with the the fuel tap in the reserve position .
When I lived in Chicago, I would bring the fuel tank into the basement and let it set for a few weeks, to let the remaining fuel evaporate, then re-install the tank on the bike in the garage .