Dust bunnies are viscious and are known to consume anything organic.
I am not sure why shoe polish can damage leather. My CDN Army boots came with a label, do not use shoe polish except for inspection. The amount of polish a cadet can apply is limited due to the polish causing the boot to deteriate. Perhaps, its just too much of a good thing. A silicone dabber was recommended instead.
I will try and find out what is wrong with shoe polish.
It is recommended that waterproof i.e. Sno-seal, Nikiwax, etc. be applied only when the leather is dry. Trapped water will cause rot.
Will