I've had similar issues after messy print failures left a bunch of solidified PLA around the print head - I found heating the extruder to 230 allowed me to easily wipe off the stuck-on material with a piece of paper towel. Minimal pressure was required to clean the print head, but still be careful about burning yourself.
Hope that helps.
Heat the nozzle using the 'set temperature' setting. This will melt the material close to the head and soften the other material making it easier to get out with needle-nose pliers.
You may have to also hit it with a heat gun too.
This happened to me until I found out how to really get the print to stick to the buildplate. If the model cuts loose it will get dragged around creating a plug against the nozzle leaving the new material nowhere to go but up into the printhead.
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