Okay Faithful, with the collective wisdom here we gotta be able to figure out some method to repel dirt daubers and keep them from building nests in dark out of the way places. Yesterday I removed the Stamoid instrument panel cover on AJ to find a big ass dirt dauber nest built right on the Sitex SP-70 autopilot head....ouch....and right next to the plastic container of moth balls....moth balls don't work.
Figuring that CX is good for just about anything, I soaked some paper towels with the stuff and placed it under the instrument panel cover. We shall see. The little suckers are not just a mess, they destroy stuff....major problem for us down here...they get under the cowl of outboard motors, into the electrical ends of gensets, on the blades of ceiling fans and un-balance them, all kinds of stuff. The nests you can see are easy enough to kill and get rid of, but I'm looking for something to repel them and keep them from building in the first place.
One thing that doesnt work from my experience are the WHY traps. Its for wasps hornets and yellow jackets and they dont go to it for who knows why. Guess they dont like the bait that comes with it.
If they are nesting in the same spots some sprays have something in them to keep them away. My problem is wasps and the spectracide commercial in the grey and black can works the best. It pretty much knocks them out of the sky. I even have nests where they didnt even fall off they just died in place. It also got a lasting effect that is sopposed to kill any stragglers that come back later. Ive killed probably a couple hundred from last summer to now and havent seen hardly any this time. for the dirt daubbers i just spray it on their dirt tunnels then knock them down a few days later. Anyway no other spray has worked better for me.
I know its not what you were looking for but maybe it will help.
I ordered a pound jar of Cynoff WP in powder form from (no kidding) www.domyownpestcontrol.com last night, about $58 but makes a lot of spray. So good they can't sell it in New York. Leaves a residue that kills all kinds of nasty critters for 90 days.
Used the Cynoff on the camp and boats. Death Powder for sure. Kills everything - dirt daubers, ants, wasps, spiders, gnats, you name it, it kills it. Amazing stuff. One pound makes about 50 gallons, so really pretty cheap in the long run, but best of all it works.