I've never seen mealy bugs, but it's good to know what to do if this happens. Dawn soap is good for a lot of pests, like white flies and aphids and probably other bugs as well.
I use my old soft bristle toothbrushes. I really don’t seem to have much of a mealy bug issue on my Agaves - but I do get infestations on lots of my other succulents .I have read that ants will actually physically move the pests around
It's in the description but I'll drop it here too. My rare stuff sells out quickly; I typically post on IG after I've added rare agaves and they go fast: www.etsy.com/shop/PalaceofSpineArts