Hello and welcome to the OB.
Increasing your air circulation, repotting in fresh media and sterile pots will go a long way towards pest elimination. A systemic spray will also help, is your fruit and veggie spray a 3 in 1? I've used it (3 in 1) on orchids and have had no ill effects but I don't know about the other, if it is "orchid safe".
Joann