It's Sta-Bil, and it's great stuff. While you can drain the gas for the same effect, you must also make sure that your carbs are thoroughly drained as well. Any pooled gasoline in them will turn into lacquer and gum up your carbs. A frightening number of small engines that are junked by their owners could be ressurected by the simple expedient of a good carb cleaning.
It also does not hurt to get some Tetralube or Rem-oil, both are available at most places that sell firearms. They are aerosol lubricants with certain additives that prevent them from drying out completely, or leaving a protective residue if they are stored so long as to completely dry. Shoot your exposed metal surfaces with a very light coating of these (or something similar, I mention firearms related products as they work extremely well).
When you pull it out of storage, just give a good once over to make sure everything looks good, do the maintainence that you should (change oil, sharpen blades/chains, and inspect wiring, etc).
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