Jumping in with both feet in Germany

[sangenuer]

Hi! I am an American living in the southwest corner of Germany. I'd been thinking about getting an orchid for a while when I saw a post on a local Facebook group offering a bunch of orchids for free. The owner had passed away and the family just wanted to be rid of them. I jumped on the chance and found myself the owner (parent?) of 20 orchids, I think all phalaenopsis. Looks like I have a new hobby!

Many or most were in rough shape. I think someone had "given them a good drink" then stuffed them all into a couple of big cardboard boxes. When I got them, I know they'd been in the trunk of a car for at least 3 hours on a cold morning (temps in upper 30s F / 3-4 C). Most of them had standing water in their outer pots, and many had obvious signs of insect problems.

Three weeks later I'm still trying to figure out what I'm doing. I've cleaned scale insects and mealybugs off the plants with rubbing alcohol, sprayed with insecticide, repotted a number of them, etc. Two tiny ones have already died. A few are starting to look like they're improving, a few are dropping leaves and looking poorly. I'm hoping to get some guidance in diagnosing and treating the issues I'm facing.

Thanks in advance!