Handpick! simple as that.
They are fairly decent sized and slow.
Unless you have really bad infestation, find them all and kill them.
Repeat as you find more over time.
That's how I got rid of them on one of my grocery store bought phal.
Oh, after you pick and kill them, make sure if there are any white stuff left on the spot where they were found. Clean them off with Q tip dipped in alcohol.