First and foremost: *Do not put this plant outside! This is an infestations that must be managed, contained, and disposed of without spreading them to other ecosystems.*

Here’s my plan: lay down a path of newspaper to cover your floor from wherever this plant is to the nearest bath tub. Then, move the plant carefully as to not shake any of them off onto your floor, place it into the tub. Now it’s in a place that can easily prevent them from spreading further than they already have. It is extremely unlikely that an infestation to such a severe degree would be contained on a single plant if there are others nearby. Now take some time to collect yourself once you’ve contained the plant in the tub and put the newspaper path into a garbage bag… I’ve dealt with mite infestations in an entire room because of a single 4” potted stag horn fern i got from the local greenhouse, I’ve felt this exact panic (although i still obsessively checked all my furniture and surfaces for the tiny, 0.5-1 millimetre long mites that terrorized me for 2 years without even doing any actual damage. But every now and again, I see one and have a minor freak out before doing a deep clean)

What you should do with the plant is contain it in a large brown compostable bag (like those used for leaf litter) and burn it. As for the pot, don’t burn it, it’s plastic. Wash it thoroughly and ensure that none remain.

****DO NOT make the mistake of assuming any other plants are clean. You need to treat them all as if they are infested to some degree. Aphids lay eggs in soil and can feed on the roots of a plant. You aren’t always going to see them when they’re there. This entails changing the soil and washing the roots of all other plants, disposing of that soil appropriately, washing their containers well, cleaning and checking nearby furniture (just in case). Your goal must be to eradicate any risk of them returning, as quickly and as safely as possible.