You can spray to kill them, but they are going to come right back.
IMO, anything you put on is going to wash right off after a rain.
I got that vinyl siding that looks like cedar shingles. The first
year after it was put up I had a huge number of bees. It seems
like each year there are less. I think they are filling up all the
easy access spots and don't want to nest in an old nest.
I say, leave them alone.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.