I usually just grab them with a wad of dry toilet paper. There was one on the wall, years ago. My mom went one way, I went the other. I came back with the wad of TP. and she came back with a hammer.
I had a roommate that would put volatile trading liquid in a jar and go around holding it under the little flies on the ceiling. After a few seconds they’d succumb to the fumes and drop into the jar.
My wife would put toothpaste on the brush, run it under the faucet, then start brushing with the now-diluted toothpaste. That’s backwards. Rinse the brush first to get rid of anything it may have picked up, put the toothpaste on it,then brush.