Hi Owen,
Have you seen this discussion? It’s a similar issue to the one you’re having. The best way to avoid this situation is to keep the tank carrier and outside of the resin tank as resin-free as possible, but sometimes spills and drips happen. I agree with Craig about the cause and have a few additional suggestions.
You might have success carefully dripping IPA under the ball in the plunger and give the tank a few good tugs from the back of the tank. If more force is needed, a few gentle taps with a wooden block and rubber mallet low on the nearest back corner of the tank might help. Pulling the front of the tank or hitting the tank with too much force may cause the tank to break and leak resin. Please be careful.
It’s probably worth it to remove as much resin as possible before trying anything that might crack the tank. Also be aware that IPA may cause crazing in the acrylic tank but this shouldn’t affect any of your prints as long as the optical window on the underside remains clear of crazing.
Let me know if this works.