Fuel stabilizer which (for an unknown period, but certainly more than a year) actually Does what it claims. Use it in my bike; that's how I Know it works - repeatedly over years.
OTOH - most of the hand-sized buzz gadgets - 2-strokes, natch - simply advise that you run it out of gas, with each use. What's so hard about that? (Yeah, overestimating - you could then drain tank, fire it back up to run out carb == still beats fiddling, dismantling for no good reason: when you didn't do this.)
My 3 lazy-kopeks