Looking for advice. I've got what I believe are paper wasps in my trailer tongue. Trailer has been sitting outside for a few months. Need to pull boat out for maintenance. Went to hook up trailer yesterday and found dozen or so wasps flying in and out of tongue; from underneath, behind the coupler. I sprayed wasp spray on and around tongue yesterday, but was difficult to spray up from ground. Went out today and saw zero activity and thought I was good. Started moving safety chains and found out otherwise. Got a couple stings through gloves. Could have been worse, except now I am less than eager to try again.

Any suggestions on how to clear them out...or kill them, from underneath? Pretty sure the nest is in the square metal tongue tube right behind coupler, though I haven't seen it yet.

I feel like @TnRiver46 is going to have a good answer.

Any pics of the trailer tongue? Can you tell where they come and go from? I’d control as much of that as you can with plastic wrap and tape and then spray through wherever else they’d come out. My alternate answer is a big trash bag and a fogger if you can do it.

Thanks, @VolFan . Agreed that fogger in garbage bag might be best option. Spraying up in there best I could seemed to have little effect. Apparently, the spray has to coat each wasp to be effective, and that isn't likely.

Fortunately, they aren't too aggressive, so I shouldn't have problem getting a bag taped around the whole front of the tongue. Not sure if tube(s) are open inside all the way back, though.

Water will do it. Once the nest gets wet, they leave.

I have wasps in my trailer tongue every summer haha. They make an expanding spray insecticide that should do it

Funny, we have this problem times 10,000 at work right now. Hollow poles metal scaffolding for fire training is absolutely loaded with wasps, we are paying an exterminator to work at it for 3 hours in the morning

That sounds like an absolute nightmare. If I let my boat sit for too long between May and the end of June I’ll find paper wasp queens trying to make nests in my boat. Knock on wood I’ve always been able to find the nests before It becomes a huge issue. Usually, I’ll see the big queen wasp coming and going building the nest. Most of the time it’s up underneath one of the gunnel’s or below my fishing platform.

My Biggest fear is not finding where the nest are until I’m 8 miles out on Saginaw bay and surprise!!!!