I suppose that what is good might vary with what exactly you are looking for it to do.
Two which work for my needs are a prescription one named Flonase
and sometimes the plain basic Walmart brand decongestant and moisturizing spray.
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"There are a thousand things that can happen when you go light a rocket engine, and only one of them is good."
Tom Mueller of SpaceX, in Air and Space, Jan. 2011