Sassimom: Have you asked about Neem oil at a local nursery? (I mean a regular growing nursery, not Home Depot, etc.) Most of them will carry it, just the brand name differs. I'm not at home right now, so can't give you the name of the product I use. I also use the Safers7 soap. It's very gentle on most plants but you need to re-apply several times. Systemics work the best to kill the eggs.
As others have stated above, mealys are difficult and time consuming to irradicate. I've been fortunate that I've never had them on my orchids; however, some garden plants, like coleus just attract the little buggars. I must admit that I have at times thrown out some container plants with mealys that became too much time and trouble to keep. Good luck with your battle.
