Your advice? Mealybug treatment & rehab for Slc.

[bethmarie]

When my friend Paul gave me this one, he'd been working on ridding it of mealybugs for a while, & thought they were gone. Not so. I just found and removed some from the flower and the new growth that produced it. That is the short and entire history of my experience with mealies.
The growth is dense enough on this plant that it doesn't seem possible I could find & remove them all manually. Just too many places to hide. I could use some experienced advice for this one, please.

It's in leca-- I don't know what the roots are like down in the medium, but you can see some on top are pretty desiccated. I suppose the medium will be harboring mealybugs or their eggs?