Since I use my saws on a weekly basis, I often leave some mix in there (no ethanol in my fuel as far as I'm aware). But I do remove mix from machines I only use once a month or less often then a weekly basis, to do that I use an RC hand-crank fuel pump (they sell electric ones, at a higher cost) the point being I don't spill any around, I don't touch it, and I can pump it into a small mix canister that I specifically keep for "re-used" mix (transparent so I can monitor it's colour) but the best thing is, the intake has an inline filter and you wouldn't believe the amount of stuff that gets caught in there!
Those tiny inline filters have a screw-on cap that you can remove to clean up the metallic mesh filter. It seems to collect all kinds of things -- you have to be careful not to run the pump backwards though.
I'm willing to bet the intake fuel filters on the saws and other machines will last a lot longer thanks to this pre-filtering step. Some cheap units won't even come with an inline fuel filter, such as strimmers, etc. So you are also saving the carbs, or at least making sure they last longer.
Then again, if you are out in the woods cutting a lot of wood, this method just doesn't cut it unless you go for the electric pump, better to just get a proper fuel canister with an inline filter on it.
I haven't been running the engines dry 'til they stop lately, I should start doing that again... I fear the leftover gas in the carb will eventually evaporate and leave a thick film of oil that ultimately will foul it.
But even when you run them dry, there's still a bit of fuel left inside... It's even worse if you don't have a primer bulb on that particular carb, there's just no way to drain it out that I'm aware of...
