Hi WW.
<Cleaning is maintain health and better nests cos most BHs are too low and polution @ birdnests.>
When you do the cleaning, do you clean up everything or have to leave some
behind for the smell?
Ans: I don't need to leave any behind cos tomorrow, there will be plentiful.
<For those very particular on nests quality, do clean more often>
I heard that after some time, they will be mites built up in the birds' poop. The mite will bite and suck the blood of baby birds and will also left one's skin itchy. How to deal with this mite. Using chemical will leave a strong smell which might drive the birds away?
Ans: When you need chemical spray....you are already there and no problem with the birds; just you with the chemical. Although, we really don't know the prolong usage of chemical in the BH but then, to control pest and mites, one need to use the chemical spray but I only use it when I find that I need it but not on regular basis like many others cos I believe a bite here and there is less dangerous than the chemical inhale into our lung. Maybe, once every 6 months for successful BHs will just do.
<Never clean up when new cos you want the aroma and not willing to pay for the smell and what better than the origin smell.>
I heard one guy recommended that for new BH,for first 2 years do not do any harvesting as this method will speed up the population in the building.
Ans: As for me, it's all depend on the performance of that particular BH but never harvest all but leave some nests to tempt other new birds to build nest near confidently. That's why you use fake nests, don't you?
I do not understand as once the fledging left the nest, the nest will not be recycle again. Birds will build new nest for fresh lay. If so, how does not harvesting helps in the multiplication of birds???
Ans: once used, the bird will reuse the nest if not harvested but will build it thicker and so you got thicker nest which will fetch lower price but you gain on time.
<Clean occasionally when OK cos you don't want to disturb too much but want to have a healthy BH.
Clean often when very successful as then, quality is what you want andnvolume isn't a topic at all.>
Very good advice. My appreciation.
WW, have you heard of a big project for BH in Jerangau, somewhere near the polo club. News or rumours that 40% harvest there is blood nest!!! I thought West Malaysia do not have blood nest, very confuse
Ans: Don't want to talk too much on the matter but just say that you can produce a square watermelon so why cannot red nest but not the purest form of nests that I can say.
Thank you in advance for your time and effort in here.
Have a good day.

Hope I answered you well.