I use 91% isopropyl alcohol in a cheap ultrasonic cleaner to clean atomizers. Works like a charm! I use the same setup to clean Boge cartomizers and Stardust clearomizers also.
If you go this route, though, be certain to let the atties/cartos/clearos
dry thoroughly! Overnight is fine for atties and clearos; several days is best for cartos. Inhaling
eliquid laced with isopropyl alcohol is not something you want to do. Isopropyl alcohol totally evaporates and leaves no harmful residue. Also,
don't use denatured alcohol: that stuff does leave residue.