The crud on the sides of parting tools is there because there was insufficient clearance for the blade of the tool. This causes heat to generate and that heat bakes on resins or whatever to the steel.
The way I use a parting tool, particularly a thin tool is to make multiple parting cuts stepwise so that clearance is provided for the heat that is generated by the cut to escape/dissipate. Just the tiniest bit of extra width will make all the difference in the parting tool's performance and will result in much less heat and baked on resins.
Sometimes the baked on gunk looks tasty but I have never given the that red hot poker a lick to find out....
I just use an old wood chisel with a fine edge to slide down the blade of the parting tool to remove the resins.
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- Crud on parting tool sides