Most all the stuff that forms deposits on my chains (bars, none yet) results from cutting really dry wood, like white ash, with chain that needs a touch of the file.
Using Granberg guide, I give each cutter a stroke or two whenever that happens. Usually coincides with saw spitting dust, not chips. Regardless, using same tooling, I give each cutter a stroke at every second fill-up, even if it doesn't need it.
Except for a mess of eastern white pine that had been severely traumatized by the '11 tornado in Monson MA, I've never experienced any sort of sappy stuff on a bar. That includes multiple species of hickory.
Easiest way to clean a chain, that I've found, is to fire up the engine, and cut some green wood.
Honest. You can over-think this. Bars & chains are meant to play in the "dirt". Woody dirt, only, of course.
