Onzow ZeroDust reportedly leaves a residue

I clean my Onxbow with a brush after every few cartridge smushes. Wonder if those close ups are re-deposited Lp detritus from a stockpile of stylus cleanings?

Using my Carson 8X magnifier (from office max) and LED flashlight I was able so see a similar debris buildup on my cantilever. At this level of magnify I can't see the stylus very well. 

I eagerly await WallyTools lab analysis of what this stuff is.

Used my supplied AudioTechnica cartridge brush to gently swipe from back to front and after several minutes managed to remove 75% of it.