I mix 10% alchohol with water in a spray bottle and when I spray my citrus plants. They get a small light dose just-in-case. Just noticed some on one of my small fig trees and I clipped a few leaves off and sprayed a nice and medium dose ( 30% alchohol ) and will repeat in a couple of days. I sent them on thier way with a good dab with a Q-tip dipped in alchohol directly onto the bug. Burns them dead on the spot. That will teach them a lesson! The bug travels from plant to plant mostly if you have two or more plants cross branching/touching each other. You might also purchase Safer garden safe insect soap. This stuff works well for me. I'm no expert but these methods seem to work well for me. Rafed Sterling Heights, Mi.

I let mine hang around for a while, but i wanted to collect seed this year... and these guys suck sap (i assume) since the seed heads wither. I just did the soapy bucket below and knock the stem... and they fall off for the most part. The small ones need some extra persuasion.

Those critters are beneficial but they are true bugs and can give you a mean bite. I wouldn't want them inside if you have inside citrus but I leave them alone outside. They prey on other bugs and worms so they can lend you a helping hand. The caveat is they are pretty non-discriminant and I have seen them eating ladybug larvae which are really great to have around. Ladybug larvae eat aphids like candy!

Not sure if you can get "rid of them forever guarantee". Perhaps they can be controlled quite a bit. Healthy plants can resist them more than stressed or sickly plants. Make sure your plants are as healthy as possible. Make sure they are not too stressed. If bringing in a new plant, thoroughly inspect it. Quaratine is recommended. Repotting it is often very good idea. They like warm and moist environment, so improve if necessary. Do not over fertilize your plants, mealies prefer new, juicy growth that may be excessive if too much fertilizer is used; and plants can be stressed by too much of it. Treatments needs to be repeated within 5-7 days to get rid of next generation. Larvae lives in soil, so treating soil could help to kill them. Using diatomaceous earth sprinkled around stems may help as it irritates them and kills them. If possible, keep plants outdoors during appropriate season. There are many beneficials outdoors that help - you could buy some (like lady bugs); but keeping them indoors could be difficult. Repotting, and using fresh potting mix helps - get rid of old one. Pots need to be cleaned and disinfected if reusing. Non-chemical treatments are usually sufficient. There are many chemicals available, but they shouldn't be used outdoors because they may kill beneficials and pollinators. Some/many could be also toxic to pets and ppl, so consider that before using... Mealies can develop resistance to most chemicals if those are used on regular basis. Inspect plants often to hopefully catch them before they spread too much. None of available insecticides will likely completely eliminate mealies. If you can't get them under control, destroying plants may be only option... I only see occasional mealy bugs on my plants, and use only rubbing alcohol to treat. Many recommend solution, but I use it full strength. Spray/dab directly on bugs. I make sure plant is not in strong sunlight while treated. This is all I can think of right now - and you probably tried most - hopefully others will chime in with more suggestions :)