Caterpillars hatched

[Anniemike]

New orchid board member here and I am glad I signed up because this morning while watering my orchids I noticed small white caterpillars in the saucer of my Cymbidium orchid. I bought the cymbidium orchid a few months ago from a local nursery. Usually, I will repot orchids once I get them, but I didn't with this one. I dumped out the medium and found more caterpillars plump and fully formed as well as very skinny long worm like caterpillars (must the growth stage). Does anyone know what kind of caterpillar this is and how to treat it? I am going to repot the cymbidium in new medium. I must have caught it early because I didn't see any damage to the roots. Can I spray alcohol on the roots to kill any eggs? Or what should I use? Any help is greatly appreciated. Fingers crossed those litter buggers didn't crawl out and go into any of my other orchid pots. I've attached a photo. Thank you!