The comb in my hive is about 3 years old. It is my understanding that after 3 years comb should be changed out? Any tips on changing out the comb. Of course this is something I will do next spring. I imagine in the brood nest there will be eggs pollen on the comb..can't really take that out? Let me know how often you change out your comb and how you go about doing it. Thank you in advance!