How to get rid of mites in guqin hard foam case

In a wet, humid, tropical place like Singapore (where I am located), mites might suddenly manifest themselves in musical instrument foam cases. I have tried using Detol, Febreze, vacuum cleaner, and even catching the mites using my naked Mach 5 eyeballs and pieces of paper napkins. However, none of them worked, as the mites would reappear again after just less than a week.

So, imagine my joy when I chanced upon this Mite removal product called "Ninja Robo" when I was shopping in Tokyu Hands in Singapore's Westgate shopping mall. I promptly purchased a pack of 3 Ninja Robo refills (Sgd$73), punctured holes in the plastic packaging that they came in, and placed them outside and inside one of my mite affected guqin hard foam cases. I hope it works. haha

This video shows how Robo Ninja works.

New brand of guqin silk strings RMB395. Made by 夕溪斋

New brand of guqin silk strings spotted on Taobao. RMB395. Made by 夕溪斋http://item.taobao.com/item.htm?spm=a230r.1.14.168.s5yMLF&id=40195457145&ns=1#detail 

(No, I am not affiliated to the taobao seller. Cutomers outside PRC may consider ordering using TaobaoRing.com) Happy shopping!