Answer:
NOTE: YOU TRY THIS AT OUR OWN RISK. First of all, it's much more likely a wasp's nest than a bee's nest. Bees do not nest in that way. Note that is is not a terribly "environmentally conscious" way of doing it - but it works the best of anything I've ever seen. Get a big can of "carburetor and throttle body/choke spray" at an auto parts counter. It will have a name very much like what I just wrote. Make sure it comes with a plastic wand "nozzle". Attach that thin wand nozzle to the can. Next part is important: WAIT UNTIL DEEP TWILIGHT. The time of evening after the sun has set, but it's still light enough to see OK, but you notice how "dusky it's getting" (usually about 45 minutes after actual sunset). Approach the nest and gently insert the nozzle into the entrance, after shaking the can well. Let 'er rip - a good half a can. Ignore any wasps you see flying out from nowhere - they are stupefied. Then take the can and beat a retreat (safety first, of course). Next day, take down the very dead nest, put it in a plastic bag, seal it, and put it in the trash. Now, you are saying: "They make special 'wasp bombs' for that - isn't that what I should use?" Do you want your best chance of not being stung? If the answer is yes, don't bother with the wasp bombs. They work - in five or ten minutes. The wasps can still sting very succesfully during that time. The carb spray works instantly - like they're on the receiving end of a firing squad.