Remove old comb?

Beekeeping - Basics
2

I think before answering your question you need to diagnose the cause of the dead out. Any evidence of disease or pests? Damp/wet? Starvation? Pesticide?

Any queen issues or concerns going into winter?

https://forum.honeyflow.com/t/dead-hive-can-i-reuse-the-entire-brood-box-cleaning-disease/24536?u=chau06