scale insect

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Hi everyone,

  I have encountered a problem I haven't had to deal with.... SCALE insects.  This past Spring, we moved from Beaumont, Tx (zone 9) to the Woodville, Tx area (zone 8), about 55 miles north.  I've noticed on a couple of plants(Aroids) that scale are getting on them.  Affected so far were Anthurium Big Bill and Monstera del (variegated).  Just a couple have been slightly infested and I've immediately taken them to the bathtub and removed them by hand.  What's the best way to kill them and prevent infestation without harming my plants?  I try so hard to use organic methods for insect control & fertilization, but I'm ready to break out the big guns on this, if necessary.  I've never had this problem, so I'm kind of at a loss.  What's safe for Aroids, but lethal to the little *%$!!!#$!?   I'm keeping a sharp eye out for any of the obvious ones, but I'm guessing that I need to treat the soil as well.  What's my best bet? 

                                       Thanks for any advice,  Sherry Gates