Debris in heatbreak, wonky rapido thermistor?

I recently switched from a rapido 1/lgx lite/ratos 2.0 configuration to a rapido 2+ UHF/orbitor 2/ratos 2.1 configuration.
I am frequently (effectively every time) getting debris between the heat break and the extruder after a filament unload. Mikl made a change to the 2.1 code base to potentially remedy this but at the moment I'm still hosed.
There is an accumulation above the heat break that is preventing me from loading filament. I've tried cleaning it out with metal rods and with filament without success in either case.
Any suggestions as to how I might clean this out?

During the investigation, I set the temperature of the hotend to 270 per the instructions for the bondtech CHT, though when I measured the temperature on the outside of the heat block just below where the wires are, it measured 237. I'm not sure how much heat is lost across that distance but it seems like it ought to be higher than that. Is this an indication of a wonky thermistor, or is this just heat loss across that short distance?

Solution

Heat up the nozzle, remove it, then heat up the steel rod to high temp (gas stove) and try pushing it through, don't let it sit too long it may affect your PTFE tube. If that doesn't work I'll let you know a more complicated version. If it works I would f investigate the length of your PTFE tube, maybe a little short, and make sure the nozzle is tight.