Chaetodon ulietensis is your best bet in a biological solution, but it's not entirely reef-safe. Lysmata wurdemanni shrimp are not very effective against Majano anemones.
You may recall the trick where one uses elegance corals' potent sting to kill aiptasia. I can confirm this works with majano too. Unfortunately, elegance corals simply don't live long in captivity these days, but I do hear reports that recent collection is back to shallow waters like the 1980s and early 90s. www.sandiegocorals.com also sells captive buds of a 80s elegance but he's usually out of stock (high demand).
The Frogspawn doesn't work in my experience because the Mojano just crawl away
I've found that scraping them off with a plastic spoon works as well as anything else. A blunt stick to just squish them also seems to work. They don't seem the have the regeneration ability that Aiptasia have.