I tried all manner of chemical treatments for majano but the problem is they are far too small and fit into far smaller holes than aiptasia. If you have a handful it's probably still manageable by those means at that point, but once you have them .. I would say > 30-40 range you're pretty much hooped unless you remove all the rock from the tank and do it rock by rock.
Being anemones they do come off the rock if you can disturb them (ie. poke) them but this wasn't an option for me as the tank itself is 30", the stand is 36", and the tallest stepladder I have is .. well I'm not sure but definitely < 36", and I'm 5'9-5'10ish.
So I didn't even bother trying that method but taller guys could probably give it a go.