Form a cone made of window screen about ten inches long and wide enough to cover the entrance at the base but tapered to about half an inch at the opening. Secure it over their entrance and make it a tight fit so that they can't crawl in behind it(harder than it sounds, they will test you). Take caulk or construction foam and seal up any other entrances that you see them using.
It is working if you see clumps of bees hanging from the cone. If they are not clumped on the cone, there is another entrance that you need to find and seal. Leave the cone on for a few weeks after you last see bees and then remove it and seal the hole.
Do it right away before they build up. They should be fairly gentle for a while but all bets are off once they establish a strong hive.

To remove them properly, the wall needs to be opened and everything taken out, when putting wall back,
make sure everything is sealed up so no bees can enter.

Konrad

I'm dealing with this same thing since yesterday morning. Not the first time over the years, because I never removed the siding and the old comb and who knows what is still in there. I've been told that bees will smell the comb no matter how old it is and be drawn to it.

Tonight I've caulking every place I see them entering and exiting except I can't reach the tiny hole about 14' up on the side of the house. I'll probably have to resort to calling an exterminator to help seal the hole and I hate to say it but spray.

I've also been told that they die over winter anyway, is that true?

Yes, if it's cold enough and not much insulation they will die.

Even if comb is scrapped out, bees can still detect the scent, I would wash everything out with Lysol or spray some chemical...bee goor similar product.

Konrad

Thanks Konrad. It's just impractical for me to remove all that wood siding even though it is the best thing to do. But - this morning I declared war and went back to the store and bought another tube of caulk. With a long aluminum clothesline support pole, I put a glob of caulk on the end of it, climbed so far up the ladder, and dobbed that caulk in the crack below the piece of siding 14' up. It actually worked, and after I got the hang of it I was able to smooth the bead out a bit with the end of the pole. Then I stood below and watched if a bee could still get in, if it did, I dobbed more caulk until I got a pretty good bead along there. I continued to caulk anywhere the bees were going in or out below, too. I'll find out how well it works this evening when most of the bees return.

I read on the internet that if you don't see pollen on the legs of the bees going in that maybe they aren't settled yet or feeding young; and they could be stray bees that smelled the old comb and are out to rob honey and take it back to their own hive. So far, I haven't seen any pollen sacs on the legs, so maybe I've lucked out.

My mom is having the same problem. She just paid a guy to remove the nest and the "robber" bees are infesting. This guy has been back several times and has yet to offer any advice on how to control these things. This last time a swarm attacked me. I am not allergic, but several stings to the head knocked me down. A large dose of liquid benedryl did help. I am thankful for your sight. It has given me more advice than the last 8 bee keepers who have dealt with this problem. My mother is 72 years old. If they swarm her like they swarmed me, they could do worse. Thanks for the info.

Understandably one has evaluate the situation if removing the siding is reasonably safe and cost effective.

Robber bees are a good thing...they will clean out the honey but
it can take several weeks. Hopefully in this period no new swarm
moves in and your'e reasonably safe! Robber bees are not really concerned
in you...they're after the honey. Right after when robber bees are gone, [more or less].. it would be a good time to seal it off.

Yesterday I discovered what appears.to be honey tyoe looking bees in our garage above our back door. They go in where an ol phone line goes into.the house. Can't see hiw many or how big. So we waited till dark tonite and took a can of spray and sprayed it inside the hole. Nothing came out (normal ??? ) then inside the house where they would be going.I'm is our half bath. I could hear buzzing in there for the next few minutes. Then silence, is this a good sign ?/could any possibly still be alive with all the spray we sprayed inside ??? I'm petrified that they will com in our home, and we have 6 children here that I worry about. Do you think this will suffice ? If I get up tomorrow morning and I see no activity where we use to, should I assume that all is well ???

Well...how did you make out?