Couple of hundred plants infested with tiny white flies - fumigation options?

[mexicowpants]

We have a BIG problem on our patio right now - tiny white flies and their cottony white larvae, also little yellowish circular capsule-like things (picture below, not sure exactly how to describe them) affecting a couple of hundred plants - Cattleya, Phalaenopsis, Dendrobium, Vanilla, Cymbidium, Epidendrum, Rhyncostele, Oncidium, Encyclia and Paphiopedilum. We'd found these on a couple of plants a couple of weeks ago and thought we'd nipped the problem in the bud, treating with soap solution and alcohol. However, today, on closer inspection, a very large number of plants are affected, too many to treat each one individually in this way.

Is there a fumigation option (commercial or industrial) that we could use to treat this without damaging the plants?



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